| Publication | Date of Publication | Type |
|---|
| Symmetries and conservation laws for the generalized n‐dimensional Ermakov system | 2024-03-04 | Paper |
| Nonlocal Constants of Motions of Equations of Painlevé – Gambier Type and Generalized Sundman Transformation | 2023-09-28 | Paper |
| Singularity analysis and analytic solutions for the Benney-Gjevik equations | 2023-07-21 | Paper |
| Lie symmetry classification for the 1+1 and 1+2 generalized Zoomeron equations | 2023-05-16 | Paper |
| New insights into singularity analysis | 2023-04-24 | Paper |
| Analysis of the Calogero-Degasperis equation through point symmetries | 2023-03-22 | Paper |
| Lie symmetry classification and qualitative analysis for the fourth-order Schr\"{o}dinger equation | 2022-05-30 | Paper |
| Symmetry analysis for a fourth-order noise-reduction partial differential equation | 2022-01-24 | Paper |
| Lie symmetry analysis and similarity solutions for the Jimbo-Miwa equation and generalisations | 2021-12-16 | Paper |
| Lie algebra of coupled higher-dimensional forced Burgers' equation | 2021-11-19 | Paper |
| Similarity solutions and conservation laws for the Bogoyavlensky-Konopelchenko equation by Lie point symmetries | 2021-09-15 | Paper |
| Symmetry analysis for the $2+1$ generalized quantum Zakharov-Kuznetsov equation | 2021-07-04 | Paper |
| Application of symmetry and singularity analyses to mathematical models of biological systems | 2021-02-18 | Paper |
| A systematic analysis of the properties of the generalised Painlevé-Ince equation | 2021-02-18 | Paper |
| Cheng equation: a revisit through symmetry analysis | 2021-02-16 | Paper |
| Symmetry Analysis for a Fourth-order Noise-reduction Partial Differential Equation | 2020-08-14 | Paper |
| Algebraic and singularity properties of a class of generalisations of the Kummer-Schwarz equation | 2020-06-09 | Paper |
| Lie Symmetry Analysis and Similarity Solutions for the Jimbo-Miwa Equation and Generalisations | 2020-06-01 | Paper |
| Noether's theorem and symmetry | 2019-11-20 | Paper |
| The algebraic properties of the space-and time-dependent one-factor model of commodities | 2019-10-15 | Paper |
| Singularity analysis of a variant of the Painlevé-Ince equation | 2019-10-02 | Paper |
| Some properties of the Nesterenko differential sequence | 2019-05-15 | Paper |
| Symmetries, travelling-wave and self-similar solutions of the Burgers hierarchy | 2019-03-28 | Paper |
| Nonlocal representation of the sl(2, R) algebra for the Chazy equation | 2019-02-18 | Paper |
| Lie symmetries of generalized Burgers equations: application to boundary-value problems | 2018-10-25 | Paper |
| Symmetries and singularities of the Szekeres system | 2017-09-26 | Paper |
| Integrability of the Einstein-nonlinear $SU(2)$ $\sigma$-model in a nontrivial topological sector | 2017-08-04 | Paper |
| On the Hojman conservation quantities in cosmology | 2017-08-03 | Paper |
| Analytical solutions in \(R+qR^n\) cosmology from singularity analysis | 2017-07-10 | Paper |
| Solution of the master equation for quantum Brownian motion given by the Schrödinger equation | 2017-06-22 | Paper |
| The Economy of Complete Symmetry Groups for Linear Higher Dimensional Systems | 2017-05-30 | Paper |
| Symmetries and Integrating Factors | 2017-05-30 | Paper |
| Jacobi's Last Multiplier and the Complete Symmetry Group of the EulerPoinsot System | 2017-05-30 | Paper |
| Some Group Theoretical Aspects of Nonlinear Quantal Oscillators | 2017-05-30 | Paper |
| A Note on the Integrability of a Class of Nonlinear Ordinary Differential Equations | 2017-05-30 | Paper |
| A Novel Riccati Sequence | 2017-05-30 | Paper |
| Derivatives of differential sequences | 2017-04-28 | Paper |
| Undefined Jacobi last multiplier? Complete symmetry group! | 2017-04-28 | Paper |
| Lie symmetries of \((1+2)\) nonautonomous evolution equations in financial mathematics | 2017-03-16 | Paper |
| Noetherian symmetries of noncentral forces with drag term | 2017-02-03 | Paper |
| Nonlinear ordinary differential equations: A discussion on symmetries and singularities | 2016-08-23 | Paper |
| Comment on “Classification of Lie point symmetries for quadratic Liénard type equation ẍ+f(x)ẋ2+g(x)=” [J. Math. Phys. 54, 053506 (2013) and its erratum [J. Math. Phys. 55, 059901 (2014)]] | 2016-03-21 | Paper |
| The Ermakov-Pinney Equation: its varied origins and the effects of the introduction of symmetry-breaking functions | 2015-10-30 | Paper |
| Symmetry analysis and algebraic structures of the Hu-Paz-Zhang Master Equation | 2015-07-08 | Paper |
| Comment on the Hojman conservation quantities in Cosmology | 2015-03-29 | Paper |
| Lie groups and quantum mechanics | 2015-02-25 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5170505 | 2014-07-23 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5418149 | 2014-06-03 | Paper |
| A study of two new generalized negative KdV type equations | 2014-05-22 | Paper |
| Singularity analysis for autonomous and nonautonomous differential equations | 2013-12-19 | Paper |
| Lie symmetries and Noether symmetries | 2013-12-19 | Paper |
| Lie algebraic approach and quantum treatment of an anisotropic charged particle via the quadratic invariant | 2013-09-24 | Paper |
| THIN FILMS: INCREASING THE COMPLEXITY OF THE MODEL | 2013-03-01 | Paper |
| Properties of the Calogero-Degasperis-Ibragimov-Shabat differential sequence | 2012-12-12 | Paper |
| On the properties of a variant of the Riccati system of equations | 2012-11-08 | Paper |
| Hidden and not so hidden symmetries | 2012-04-04 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3114287 | 2012-02-04 | Paper |
| Hierarchies of similarity symmetries and singularity analysis | 2012-01-02 | Paper |
| Periodic solutions and associated limit cycle for the generalised Chazy equation | 2012-01-02 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3099131 | 2011-12-01 | Paper |
| Some Lagrangians for systems without a Lagrangian | 2011-08-03 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3006817 | 2011-06-21 | Paper |
| https://portal.mardi4nfdi.de/entity/Q2999556 | 2011-05-13 | Paper |
| The Quantization of a Fourth-Order Equation without a Second-Order Lagrangian | 2011-05-03 | Paper |
| Group classification of a class of equations arising in financial mathematics | 2010-09-13 | Paper |
| Quasi-Lie schemes and Emden–Fowler equations | 2010-08-17 | Paper |
| The method of Ostrogradsky, quantization, and a move toward a ghost-free future | 2010-08-17 | Paper |
| An algebraic approach to laying a ghost to rest | 2010-06-08 | Paper |
| Symmetries, integrals and solutions of ordinary differential equations of maximal symmetry | 2010-05-03 | Paper |
| An Old Method of Jacobi to Find Lagrangians | 2010-03-29 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3649383 | 2009-12-03 | Paper |
| The Ermakov equation: A commentary | 2009-12-03 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3645926 | 2009-11-18 | Paper |
| Some properties of Lagrangian sequences | 2009-11-13 | Paper |
| Aspects of proper differential sequences of ordinary differential equations | 2009-11-06 | Paper |
| Lie algebraic treatment of the quadratic invariants for a quantum system | 2009-11-06 | Paper |
| Complete symmetry group and nonlocal symmetries for some two-dimensional evolution equations | 2009-06-23 | Paper |
| Noetherian first integrals | 2009-04-23 | Paper |
| Singularity Analysis and Integrability of a Simplified Multistrain Model for the Transmission of Tuberculosis and Dengue Fever | 2009-04-23 | Paper |
| The Jacobi Last Multiplier and its applications in mechanics | 2009-03-26 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3606312 | 2009-02-26 | Paper |
| The Riccati and Ermakov-Pinney hierarchies | 2009-02-26 | Paper |
| Integrability analysis of the Emden-Fowler equation | 2009-02-26 | Paper |
| Jacobi’s last multiplier and Lagrangians for multidimensional systems | 2009-01-23 | Paper |
| Lagrangians galore | 2008-12-08 | Paper |
| Symmetry and singularity properties of the generalised Kummer-Schwarz and related equa\-tions | 2008-10-06 | Paper |
| The Mixmaster Universe: the final reckoning? | 2008-04-28 | Paper |
| An invariant for the doubly generalized classical Ermakov–Pinney system and its quantal equivalent | 2008-03-31 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5454425 | 2008-03-28 | Paper |
| Algebraic properties of evolution partial differential equations modelling prices of commodities | 2008-03-27 | Paper |
| Nonlinear shear‐free radiative collapse | 2008-03-07 | Paper |
| In simplicitate veritas | 2008-01-21 | Paper |
| Heuristic analysis of the complete symmetry group and nonlocal symmetries for some nonlinear evolution equations | 2008-01-21 | Paper |
| The method of reduction of order and linearization of the two‐dimensional Ermakov system | 2008-01-21 | Paper |
| Symmetry and singularity properties of a system of ordinary differential equations arising in the analysis of the nonlinear telegraph equations | 2007-09-26 | Paper |
| Lie integrable cases of the simplified multistrain/two-stream model for tuberculosis and dengue fever | 2007-06-26 | Paper |
| Fuchs’ solution of Painlevé VI equation by means of Jacobi’s last multiplier | 2007-05-16 | Paper |
| On Differential Sequences | 2007-04-24 | Paper |
| Properties of the Dominant Behaviour of Quadratic Systems | 2007-04-19 | Paper |
| Nonlocal Symmetries and the Complete Symmetry Group of 1 + 1 Evolution Equations | 2007-04-19 | Paper |
| Analytic Behaviour of Competition among Three Species | 2007-04-19 | Paper |
| Symmetry and singularity properties of second-order ordinary differential equations of Lie's Type III. | 2007-02-12 | Paper |
| Autonomous self-similar ordinary differential equations and the Painlevé connection | 2007-02-12 | Paper |
| Heat polynomials and Lie point symmetries | 2006-08-04 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5476895 | 2006-07-20 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5476901 | 2006-07-20 | Paper |
| Symmetry properties of autonomous integrating factors | 2006-07-04 | Paper |
| ‘Air’ polynomials, Lie point symmetries and a hyperbolic equation | 2006-05-22 | Paper |
| Lie symmetries, quantisation and \(c\)-isochronous nonlinear oscillators | 2006-05-16 | Paper |
| Riemann's equation and Lie point symmetries | 2006-05-03 | Paper |
| Symmetry Reductions of a Hamilton-Jacobi-Bellman Equation Arising in Financial Mathematics | 2005-09-05 | Paper |
| Jacobi's Last Multiplier and the Complete Symmetry Group of the Ermakov-Pinney Equation | 2005-09-05 | Paper |
| Wavefunctions for the time-dependent linear oscillator and Lie point symmetries | 2005-06-24 | Paper |
| Ordinary differential equations invariant under translation in the independent variable and rescaling: The Lagrangian formulation | 2005-06-01 | Paper |
| Generalised Symmetries and the Ermakov-Lewis Invariant | 2005-04-29 | Paper |
| The solution of some quantum nonlinear oscillators with the common symmetry groupSL(2,R) | 2005-04-18 | Paper |
| Jacobi's last multiplier and symmetries for the Kepler problem plus a lineal story | 2005-04-15 | Paper |
| Wigner functions for time-dependent coupled linear oscillators via linear and quadratic invariant processes | 2005-03-10 | Paper |
| An oscillatory population model | 2005-03-08 | Paper |
| Reduction of the classical MICZ-Kepler problem to a two-dimensional linear isotropic harmonic oscillator | 2004-12-15 | Paper |
| The Ermanno–Bernoulli constants and representations of the complete symmetry group of the Kepler problem | 2004-12-14 | Paper |
| The complete symmetry group of the generalised hyperladder problem | 2004-08-06 | Paper |
| The ladder problem: Painlevé integrability and explicit solution | 2004-06-10 | Paper |
| A note on the construction of the Ermakov$ndash$Lewis invariant | 2004-06-09 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4460155 | 2004-05-18 | Paper |
| Competing Species: Integrability and Stability | 2004-03-18 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4455779 | 2004-03-16 | Paper |
| An integrable SIS model. | 2004-03-14 | Paper |
| Linear and quadratic invariants for the transformed Tavis–Cummings model | 2004-03-07 | Paper |
| Generalisations of the LaplaceRungeLenz Vector | 2004-02-19 | Paper |
| On the equivalence of linear equations under nonlocal transformation. | 2004-01-06 | Paper |
| First integrals and reduction of a class of nonlinear higher order ordinary differential equations. | 2004-01-06 | Paper |
| Equivalence classes of second-order ordinary differential equations with only a three-dimensional Lie algebra of point symmetries and linearisation. | 2003-09-04 | Paper |
| Computation of the effective volumes of covalently bonded molecules | 2003-07-27 | Paper |
| Ever-expanding, isotropizing, quadratic cosmologies | 2003-05-01 | Paper |
| Symmetry, singularities and integrability in complex dynamics. VI: Integrability properties of FRW-scalar cosmologies | 2003-02-08 | Paper |
| Complete symmetry groups of ordinary differential equations and their integrals: Some basic considerations | 2002-11-18 | Paper |
| Symmetry analysis of and first integrals for the continuum Heisenberg spin chain | 2002-11-04 | Paper |
| Symmetry, Singularities and Integrability in Complex Dynamics III: Approximate Symmetries and Invariants | 2002-09-16 | Paper |
| Symmetry, singularities, and integrability in complex dynamics. II: Rescaling and time-translation in two-dimensional systems | 2002-09-04 | Paper |
| Symmetry, singularities and integrability in complex dynamics. IV: Painlevé integrability of isotropic cosmologies | 2002-09-03 | Paper |
| Symmetry, Singularities and Integrability in Complex Dynamics V: Complete Symmetry Groups of Certain Relativistic Spherically Symmetric Systems | 2002-08-01 | Paper |
| Symmetry, Singularities and Integrability in Complex Dynamics I: The Reduction Problem | 2002-07-28 | Paper |
| First Integrals and Parametric Solutions for Equations Integrable Through Lie Symmetries | 2002-06-26 | Paper |
| Exponential nonlocal symmetries and nonnormal reduction of order | 2002-06-11 | Paper |
| The harmony in the Kepler and related problems | 2002-02-26 | Paper |
| The algebraic structure of the first integrals of third-order linear equations | 2002-01-30 | Paper |
| The determination of nonlocal symmetries by the technique of reduction of order | 2002-01-07 | Paper |
| Exceptional properties of second and third order ordinary differential equations of maximal symmetry | 2001-12-18 | Paper |
| Solutions in closed form and as power series to the real Lorenz equations | 2001-11-19 | Paper |
| Comment: Comment on a paper concerning symmetries of equations of motion and equivalent Lagrangians | 2001-07-02 | Paper |
| A classical viewpoint on quantum chaos | 2001-03-12 | Paper |
| Symmetries of homogeneous cosmologies | 2001-01-04 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4515649 | 2000-11-22 | Paper |
| Comment on a theorem of Hojman and its generalizations | 2000-10-10 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4234545 | 2000-06-26 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4486180 | 2000-06-26 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4234549 | 2000-04-09 | Paper |
| Noetherian integrals via nonlocal transformation | 2000-02-08 | Paper |
| Integration of second order ordinary differential equations not possessing Lie point symmetries | 2000-02-08 | Paper |
| Ermakov systems: A group-theoretic approach | 2000-02-06 | Paper |
| A group theoretic approach to a class of second-order ordinary differential equations not possessing Lie point symmetries | 1999-12-13 | Paper |
| On the singularity analysis of ordinary differential equations invariant under time translation and rescaling | 1999-12-05 | Paper |
| Symmetries of first integrals and their associated differential equations | 1999-10-25 | Paper |
| On the uniqueness of the Schwarzian and linearisation by nonlocal contact transformation | 1999-10-25 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4234544 | 1999-10-06 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4236986 | 1999-04-22 | Paper |
| An Elementary Demonstration of the Existence of $s\ell(3,R)$ Symmetry for all Second-Order Linear Ordinary Differential Equations | 1999-02-22 | Paper |
| CONSERVATION LAWS FOR THE MONOPOLE OSCILLATOR PROBLEM | 1998-06-01 | Paper |
| Hidden and contact symmetries of ordinary differential equations | 1998-01-29 | Paper |
| Characterisation of the algebraic properties of first integrals of scalar ordinary differential equations of maximal symmetry | 1998-01-19 | Paper |
| Solid angles 5. Chiral molecules and the case of face selectivity | 1997-11-23 | Paper |
| Connection between the existence of first integrals and the painlevé property in two-dimensional lotka-volterra and quadratic systems | 1997-10-27 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4349490 | 1997-08-24 | Paper |
| On the determination of non-local symmetries | 1997-04-29 | Paper |
| USE OF LIE SYMMETRIES AND THE PAINLEVÉ ANALYSIS IN COSMOLOGY | 1997-02-03 | Paper |
| Exact solutions for the Tikekar superdense star | 1997-01-22 | Paper |
| Expanding spherically symmetric models without shear | 1996-10-24 | Paper |
| Painleve analysis of the mixmaster universe | 1996-03-07 | Paper |
| Integrability of generalized Ermakov systems | 1995-09-17 | Paper |
| Integrability analysis of a conformal equation in relativity | 1995-08-03 | Paper |
| Noether equivalence problem for particle Lagrangians | 1995-06-13 | Paper |
| Solution of generalized Emden-Fowler equations with two symmetries | 1995-05-21 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4283186 | 1995-05-01 | Paper |
| The Painleve test, hidden symmetries and the equation y"+yy'+Ky3=0 | 1994-11-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4284768 | 1994-06-22 | Paper |
| Symmetries of Hamiltonian one-dimensional systems | 1994-05-03 | Paper |
| The Lie analysis and solutions for a class of second-order nonlinear ordinary differential equations | 1994-05-03 | Paper |
| Analysis and solution of a nonlinear second-order differential equation through rescaling and through a dynamical point of view | 1994-04-20 | Paper |
| GENERALIZED ERMAKOV SYSTEMS IN TERMS OFsl(2,R) INVARIANTS | 1994-04-19 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4284770 | 1994-04-17 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4284758 | 1994-03-24 | Paper |
| Lie and Noether counting theorems for one-dimensional systems | 1994-03-17 | Paper |
| The first integrals and their Lie algebra of the most general autonomous Hamiltonian of the form H = T + V possessing a Laplace-Runge-Lenz vector | 1993-10-19 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4036633 | 1993-05-18 | Paper |
| Self-similar solutions of the generalized Emden-Fowler equation | 1993-04-01 | Paper |
| On the elementary Schrödinger bound states and their multiplets | 1993-04-01 | Paper |
| A first integral for a class of time-dependent anharmonic oscillators with multiple anharmonicities | 1993-03-09 | Paper |
| Contact symmetry algebras of scalar second-order ordinary differential equations | 1992-06-28 | Paper |
| Representations of one-dimensional Hamiltonians in terms of their invariants | 1992-06-28 | Paper |
| FIRST INTEGRALS ASSOCIATED WITH THE ADDITIONAL SYMMETRY OF CENTRAL FORCE PROBLEMS WITH POWER LAW POTENTIALS | 1992-06-26 | Paper |
| Shear-free spherically symmetric solutions with conformal symmetry | 1991-01-01 | Paper |
| Properties of second-order ordinary differential equations invariant under time translation and self-similar transformation | 1991-01-01 | Paper |
| Symmetry Lie algebras of \(n\)th order ordinary differential equations | 1990-01-01 | Paper |
| The Schrodinger equation for the f(x)/g(x) interaction | 1990-01-01 | Paper |
| Berry's phase and wavefunctions for time-dependent Hamilton systems | 1990-01-01 | Paper |
| The relationship between the symmetries of and the existence of conserved vectors for the equation r..+f(r)L+g(r)r=0 | 1990-01-01 | Paper |
| A Rodrigues formula approach to determining closed-form solutions to the Schrödinger equation for symmetric anharmonic oscillators | 1989-01-01 | Paper |
| THE LIE ALGEBRA sl(3, R) AND LINEARIZATION | 1989-01-01 | Paper |
| Lie algebras associated with scalar second-order ordinary differential equations | 1989-01-01 | Paper |
| Symmetry vector fields and similarity solutions of a nonlinear field equation describing the relaxation to a Maxwell distribution | 1988-01-01 | Paper |
| Lie point symmetries for systems of second order linear ordinary differential equations | 1988-01-01 | Paper |
| Maximal subalgebra associated with a first integral of a system possessing sl(3,R) algebra | 1988-01-01 | Paper |
| Conserved vectors for the autonomous system \(\ddot r+g(r,\theta)\hat r+h(r,\theta){\hat \theta}=0\) | 1987-01-01 | Paper |
| Symmetries of nonlinear differential equations and linearisation | 1987-01-01 | Paper |
| The first integrals and orbit equation for the Kepler problem with drag | 1987-01-01 | Paper |
| Hamilton-like vectors for a class of Kepler problems with a force proportional to the velocity | 1987-01-01 | Paper |
| The Schrodinger equation for the x2+λx2/(1+gx2) interaction | 1987-01-01 | Paper |
| Comment on an aspect of a paper by G. Thompson | 1986-01-01 | Paper |
| Erratum: Comment on an aspect of a paper by G. Thompson [J. Math. Phys. 2 7, 153 (1986)] | 1986-01-01 | Paper |
| A resonance formulation for invariants of particle motion in a one- dimensional time-dependent potential | 1985-01-01 | Paper |
| First integrals versus configurational invariants and a weak form of complete integrability | 1985-01-01 | Paper |
| Classes of potentials of time-dependent central force fields which possess first integrals quadratic in the momenta | 1985-01-01 | Paper |
| First integrals for the modified Emden equation q̈+α(t) q̇+q n =0 | 1985-01-01 | Paper |
| THE LINEAR SYMTRIES OF A NONLINEAR DIFFERENTIAL EQUATION | 1985-01-01 | Paper |
| Exact solutions of the Schrödinger equation for a class of three-dimensional isotropic anharmonic oscillators | 1984-01-01 | Paper |
| First integrals via polynomial canonical transformations | 1984-01-01 | Paper |
| First integrals for some nonlinear time-dependent Hamiltonian systems | 1984-01-01 | Paper |
| Harmonic oscillator with variable mass | 1983-01-01 | Paper |
| A direct approach to finding exact invariants for one-dimensional time-dependent classical Hamiltonians | 1982-01-01 | Paper |
| Exact invariants for a class of time-dependent nonlinear Hamiltonian systems | 1982-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3962522 | 1982-01-01 | Paper |
| An exact invariant for a class of time-dependent anharmonic oscillators with cubic anharmonicity | 1981-01-01 | Paper |
| A further note on the Hénon–Heiles problem | 1981-01-01 | Paper |
| Applications of the Lie theory of extended groups in Hamiltonian mechanics: the oscillator and the Kepler problem | 1981-01-01 | Paper |
| Sl(3,R) and the repulsive oscillator | 1980-01-01 | Paper |
| The complete symmetry group of a forced harmonic oscillator | 1980-01-01 | Paper |
| Quadratic Hamiltonians: The four classes of quadratic invariants, their interrelations and symmetries | 1980-01-01 | Paper |
| The complete symmetry group of the one-dimensional time-dependent harmonic oscillator | 1980-01-01 | Paper |
| A note on the Hénon–Heiles problem | 1980-01-01 | Paper |
| On nonlinear transformations for time-dependent polynomial Hamiltonians | 1979-01-01 | Paper |
| Towards an invariant for the time-dependent anharmonic oscillator | 1979-01-01 | Paper |
| On a Generalization of the Lewis Invariant for the Time-Dependent Harmonic Oscillator | 1978-01-01 | Paper |
| On a direct method for the determination of an exact invariant for the time-dependent harmonic oscillator | 1977-01-01 | Paper |
| On the theory of time-dependent linear canonical transformations as applied to Hamiltonians of the harmonic oscillator type | 1977-01-01 | Paper |
