| Publication | Date of Publication | Type |
|---|
| https://portal.mardi4nfdi.de/entity/Q5885171 | 2023-03-27 | Paper |
| Deceptive systems of differential equations | 2022-10-09 | Paper |
| Multiple solutions for Schrödinger lattice systems with asymptotically linear terms and perturbed terms | 2022-03-31 | Paper |
| Schrödinger equations in nonlinear optics | 2021-09-07 | Paper |
| Critical point theory in infinite dimensional spaces using the Leray-Schauder index | 2021-09-07 | Paper |
| Canonical systems of partial differential equations | 2021-09-07 | Paper |
| Multiple homoclinic solutions for discrete Schrödinger equations with perturbed and sublinear terms | 2021-05-19 | Paper |
| Linking in infinite dimensional spaces using the Leray-Schauder index | 2021-04-14 | Paper |
| Solving Linear Partial Differential Equations | 2020-05-29 | Paper |
| Critical Point Theory | 2020-05-18 | Paper |
| Multiple solutions for non-periodic Schrödinger lattice systems with perturbation and super-linear terms | 2019-10-08 | Paper |
| Non-periodic Schrödinger lattice systems with perturbed and asymptotically linear terms: negative energy solutions | 2019-04-26 | Paper |
| Multiple periodic solutions for damped vibration systems with general nonlinearities at infinity | 2019-02-20 | Paper |
| Applications of a theorem of Brezis-Nirenberg | 2019-01-24 | Paper |
| Rigorous Results on the Existence of Dyon Solutions | 2019-01-10 | Paper |
| Multiple solutions of second order Hamiltonian systems | 2018-09-03 | Paper |
| Some notes on a superlinear second order Hamiltonian system | 2017-10-10 | Paper |
| Carathéodory Functions in Partial Differential Equations | 2017-09-25 | Paper |
| Global solutions of nonlinear Schrödinger equations | 2017-05-15 | Paper |
| Non-periodic discrete Schrödinger equations: ground state solutions | 2016-10-14 | Paper |
| Homoclinic solutions of nonlinear second-order Hamiltonian systems | 2016-10-11 | Paper |
| Existence solutions for second order Hamiltonian systems | 2015-12-22 | Paper |
| Nonlinear Schrödinger operators with zero in the spectrum | 2015-11-24 | Paper |
| Existence of the solution to electromagnetic wave scattering problem for an impedance body of an arbitrary shape | 2015-05-06 | Paper |
| Periodic second order superlinear Hamiltonian systems | 2015-02-11 | Paper |
| Ground state solutions for non-autonomous dynamical systems | 2014-11-06 | Paper |
| Non-autonomous second order Hamiltonian systems | 2014-05-09 | Paper |
| Semi-classical bound states of Schrödinger equations | 2014-04-11 | Paper |
| Photonic lattices | 2014-03-06 | Paper |
| Sign-changing critical points via sandwich pair theorems | 2014-02-13 | Paper |
| Steady state solutions for Schrödinger equations governing nonlinear optics | 2013-11-20 | Paper |
| Noncooperative elliptic systems | 2013-02-04 | Paper |
| Sandwich systems | 2013-01-14 | Paper |
| Topics in Critical Point Theory | 2012-12-14 | Paper |
| Monotonicity methods for noncooperative elliptic systems | 2012-12-13 | Paper |
| Morse theory applied to semilinear problems | 2012-12-13 | Paper |
| An Introduction to Nonlinear Analysis | 2012-09-27 | Paper |
| https://portal.mardi4nfdi.de/entity/Q2910137 | 2012-09-07 | Paper |
| Applications of sandwich pairs | 2012-05-20 | Paper |
| Superlinear Schrödinger operators | 2012-03-22 | Paper |
| THE ROLE OF CORE FUNCTIONS IN SEMILINEAR ELLIPTIC PROBLEMS | 2011-10-11 | Paper |
| Custom monotonicity methods | 2011-08-29 | Paper |
| Nonautonomous second order Hamiltonian systems | 2011-08-22 | Paper |
| On the Brézis-Nirenberg problem | 2010-09-10 | Paper |
| Monotonicity methods for infinite dimensional sandwich systems | 2010-07-23 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3560425 | 2010-05-14 | Paper |
| Variant sandwich pairs | 2010-03-10 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3647018 | 2009-11-27 | Paper |
| Linking sandwich pairs | 2009-11-19 | Paper |
| Systems of sandwich pairs | 2009-10-23 | Paper |
| Flows and critical points | 2009-10-19 | Paper |
| Minimax Systems and Critical Point Theory | 2009-07-21 | Paper |
| Sandwich pairs for \(p\)-Laplacian systems | 2009-07-15 | Paper |
| Custom sandwich pairs | 2009-05-05 | Paper |
| Saddle point techniques | 2009-02-04 | Paper |
| Infinite-dimensional sandwich pairs | 2008-11-14 | Paper |
| Critical point methods | 2008-09-10 | Paper |
| Strong sandwich pairs | 2008-08-26 | Paper |
| Minimax systems | 2008-06-24 | Paper |
| Sandwich pairs in critical point theory | 2008-06-17 | Paper |
| The use of Cerami sequences in critical point theory | 2008-02-20 | Paper |
| Periodic solutions of second-order nonautonomous dynamical systems | 2008-02-20 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5439528 | 2008-02-11 | Paper |
| Finding linking sets | 2008-02-01 | Paper |
| Sandwich pairs in \(p\)-Laplacian problems | 2008-01-18 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5428533 | 2007-11-22 | Paper |
| Sign-changing critical points from linking type theorems | 2007-02-01 | Paper |
| Semilinear problems in unbounded domains | 2007-01-09 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5486097 | 2006-09-06 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5485942 | 2006-09-05 | Paper |
| Periodic non-autonomous second-order dynamical systems | 2006-05-16 | Paper |
| Infinitely many solutions to perturbed elliptic equations | 2005-11-22 | Paper |
| Linking in Hilbert space | 2005-11-09 | Paper |
| Semilinear problems with bounded nonlinear term | 2005-10-24 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4667283 | 2005-04-19 | Paper |
| Superlinear problems | 2005-02-16 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3158585 | 2005-01-27 | Paper |
| New Linking Theorem and Sign-Changing Solutions | 2005-01-20 | Paper |
| An infinite-dimensional linking theorem and applications | 2004-08-10 | Paper |
| On functionals bounded below | 2004-05-18 | Paper |
| Double linking theorem and multiple solutions. | 2004-02-03 | Paper |
| Weak linking. | 2003-11-17 | Paper |
| Double resonance problems with respect to the Fucik spectrum | 2003-10-13 | Paper |
| Weak Linking Theorems and Schrödinger Equations with Critical Sobolev Exponent | 2003-08-20 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4414314 | 2003-07-24 | Paper |
| Homoclinic orbits for Schrödinger systems. | 2003-06-30 | Paper |
| Computation of critical groups in Fučík resonance problems. | 2003-05-25 | Paper |
| Periodic solutions of semilinear higher dimensional wave equations | 2003-03-19 | Paper |
| Multiple solutions for semilinear elliptic problems | 2002-12-15 | Paper |
| Critical Groups in Saddle Point Theorems without a Finite Dimensional Closed Loop | 2002-10-16 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4547137 | 2002-08-21 | Paper |
| Semilinear elliptic equations having asymptotic limits at zero and infinity | 2002-06-23 | Paper |
| https://portal.mardi4nfdi.de/entity/Q2770567 | 2002-02-13 | Paper |
| Multiple nontrivial solutions of elliptic semilinear equations | 2001-12-03 | Paper |
| Rotationally invariant periodic solutions of semilinear wave equations | 2001-11-27 | Paper |
| Applications of Morse theory to the solution of semilinear problems depending on \(C^1\) functionals | 2001-07-29 | Paper |
| A generalization of the Amann-Zehnder theorem to nonresonance problems with jumping nonlinearities | 2001-07-02 | Paper |
| The Fucik spectrum and critical groups | 2001-05-14 | Paper |
| Nontrivial solutions of elliptic semilinear equations at resonance | 2001-01-04 | Paper |
| Solution of nonlinear equations having asymptotic limits at zero and infinity. | 2001-01-01 | Paper |
| Critical point theory with weak-to-weak linking | 2000-08-21 | Paper |
| Type II regions between curves of the Fučik spectrum and critical groups | 2000-07-10 | Paper |
| Resonance problems with respect to the Fucík spectrum | 2000-06-18 | Paper |
| Morse index estimates in saddle point theorems without a finite dimensional closed loop | 2000-04-09 | Paper |
| Infinite-dimensional linking | 2000-03-27 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4400954 | 1999-01-11 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4223582 | 1999-01-05 | Paper |
| The intrinsic mountain pass | 1998-11-17 | Paper |
| Type (II) regions between curves of the Fučik spectrum | 1998-08-20 | Paper |
| New linking theorems | 1998-08-02 | Paper |
| Resonance Problems Which Intersect Many Eigenvalues | 1998-02-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3837521 | 1997-08-04 | Paper |
| Critical points when there is no saddle point geometry | 1997-07-06 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4871580 | 1996-10-14 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4869325 | 1996-09-04 | Paper |
| Superlinear elliptic boundary value problems | 1996-06-25 | Paper |
| Infinite-dimensional singularity theory and bifurcation from equilibria for certain nonlinear evolution equations | 1996-04-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4843337 | 1996-03-18 | Paper |
| The Saddle Point Alternative | 1996-02-20 | Paper |
| Landesman–Lazer resonance problems and saddle point methods | 1995-12-05 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4850189 | 1995-10-09 | Paper |
| Elliptic resonance problems with unequal limits at infinity | 1995-08-06 | Paper |
| Bounded resonance problems for semilinear elliptic equations | 1995-07-17 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4835016 | 1995-06-22 | Paper |
| Semilinear boundary value problems of the strong resonance type | 1995-02-01 | Paper |
| Splitting subspaces and saddle points | 1994-12-19 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4297494 | 1994-09-25 | Paper |
| Asymptotically linear elliptic boundary value problems | 1994-04-28 | Paper |
| Critical points over splitting subspaces | 1994-01-18 | Paper |
| Nonlinear eigenvalues and mountain pass methods | 1994-01-13 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3135689 | 1993-10-06 | Paper |
| A generalization of the saddle point method with applications | 1993-06-29 | Paper |
| A Bounded Mountain Pass Lemma Without the (PS) Condition and Applications | 1993-01-16 | Paper |
| A Variation of the Mountain Pass Lemma and Applications | 1992-09-27 | Paper |
| Points of Spherical Maxima and Solvability of Semilinear Elliptic Equations | 1992-09-27 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3974743 | 1992-06-26 | Paper |
| The mountain pass alternative | 1992-06-25 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3974426 | 1992-06-25 | Paper |
| Families of 'first eigenfunctions' for semilinear elliptic eigenvalue problems | 1991-01-01 | Paper |
| Unrestricted variables in linear programming | 1991-01-01 | Paper |
| Eigenvalues for semilinear boundary value problems | 1991-01-01 | Paper |
| Nonlinear Elliptic Boundary Value Problems at Strong Resonance | 1990-01-01 | Paper |
| Spherical maxima in Hilbert space and semilinear elliptic eigenvalue problems | 1990-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3209734 | 1990-01-01 | Paper |
| Nonlinear elliptic boundary value problems at resonance | 1990-01-01 | Paper |
| The Hampwile theorem for nonlinear eigenvalues | 1989-01-01 | Paper |
| The Spectrum of the Schrodinger Operator | 1989-01-01 | Paper |
| Multiplication Operators | 1989-01-01 | Paper |
| Potential estimates in Orlicz spaces | 1988-01-01 | Paper |
| Boundary value problems for semilinear elliptic equations of arbitrary order in unbounded domains | 1988-01-01 | Paper |
| Best Fredholm perturbation theorems | 1988-01-01 | Paper |
| Weighted Norm Inequalities for Potential Operators | 1988-01-01 | Paper |
| Exact Estimates for Potentials | 1988-01-01 | Paper |
| Polyhedral functions and multiparametric linear programming | 1987-01-01 | Paper |
| Semilinear boundary value problems for unbounded domains | 1987-01-01 | Paper |
| Two space scattering and propagative systems | 1987-01-01 | Paper |
| Weighted Norm Estimates for Sobolev Spaces | 1987-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3746171 | 1986-01-01 | Paper |
| Derivatives of Mappings With Applications to Nonlinear Differential Equations | 1986-01-01 | Paper |
| Differentiation in abstract spaces | 1984-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3219335 | 1984-01-01 | Paper |
| Imbedding estimates involving new norms and applications | 1984-01-01 | Paper |
| Self-Adjoint Realizations in Another Hilbert Space | 1984-01-01 | Paper |
| A theorem on the existence of dyon solutions | 1981-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3711239 | 1981-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3905971 | 1981-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3948056 | 1981-01-01 | Paper |
| Wave operators for pairs of spaces and the Klein-Gordon equation | 1980-01-01 | Paper |
| Unique continuation for Schrödinger operators with unbounded potentials | 1980-01-01 | Paper |
| The continuous singular spectrum of the Schrödinger operator | 1980-01-01 | Paper |
| Two space scattering theory using the subspace of continuity | 1979-01-01 | Paper |
| The invariance principle | 1979-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3660152 | 1979-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3888000 | 1979-01-01 | Paper |
| Scattering in Two Hilbert Spaces | 1979-01-01 | Paper |
| Another look at scattering theory | 1978-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3887999 | 1978-01-01 | Paper |
| Solution of the Nonlinear Problem Au = N(u) in a Banach Space | 1978-01-01 | Paper |
| A new criterion for scattering theory | 1977-01-01 | Paper |
| Sufficient conditions for duality in homogeneous programming | 1977-01-01 | Paper |
| On the solvability of semilinear gradient operator equations | 1977-01-01 | Paper |
| Wave operators for oscillating potentials | 1977-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4118182 | 1977-01-01 | Paper |
| The schrodinger operator with vector potential | 1977-01-01 | Paper |
| The existence of wave operators in scattering theory | 1977-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4157053 | 1977-01-01 | Paper |
| Remarks on a previous paper | 1976-01-01 | Paper |
| Scattering theory for ellptic systems | 1976-01-01 | Paper |
| The Klein-Gordon equation and scattering theory | 1976-01-01 | Paper |
| Cut-off potentials and forms extensions | 1976-01-01 | Paper |
| Eigenfunction expansions for the Schrödinger operator | 1976-01-01 | Paper |
| SCATTERING THEORY FOR PSEUDODIFFERENTIAL OPERATORS | 1976-01-01 | Paper |
| On the spectra of singular elliptic operators | 1976-01-01 | Paper |
| Discreteness of the singular spectrum for Schrödinger operators | 1976-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4122281 | 1976-01-01 | Paper |
| Proper boundary points of the spectrum | 1975-01-01 | Paper |
| A unified approach to scattering | 1975-01-01 | Paper |
| Nonhomogeneous elliptic systems and scattering | 1975-01-01 | Paper |
| Essential self-adjointness of the Schrödinger operator with magnetic vector potential | 1975-01-01 | Paper |
| Scattering theory for second order elliptic operators | 1975-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4090902 | 1975-01-01 | Paper |
| On the existence, uniqueness and regularity of solutions to general elliptic boundary-value problems | 1974-01-01 | Paper |
| Scattering theory for elliptic operators of arbitrary order | 1974-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4056996 | 1974-01-01 | Paper |
| Embedding Theorems and Quasi-Linear Elliptic Boundary Value Problems for Unbounded Domains | 1973-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5671072 | 1973-01-01 | Paper |
| A Generalized Operational Calculus Developed from Fredholm Operator Theory | 1973-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5682816 | 1973-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5182706 | 1972-01-01 | Paper |
| On the solvability of semilinear operator equations and elliptic boundary value problems | 1972-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5679324 | 1972-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5612063 | 1971-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5631480 | 1971-01-01 | Paper |
| Semigroups of operators and measures of noncompactness | 1971-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5597159 | 1970-01-01 | Paper |
| 𝐿_{𝑝} embedding and nonlinear eigenvalue problems for unbounded domains | 1970-01-01 | Paper |
| The conjugate of a product of operators | 1970-01-01 | Paper |
| Tensor products and joint spectra | 1970-01-01 | Paper |
| Partial differential operators on $L^p \left( {E^n } \right)$ | 1969-01-01 | Paper |
| Norms on quotient spaces | 1969-01-01 | Paper |
| On Perturbations of Essential Spectra | 1969-01-01 | Paper |
| On the spectra of operators on tensor products | 1969-01-01 | Paper |
| The spectra of non-elliptic operators | 1969-01-01 | Paper |
| On the essential spectrum of an elliptic operator perturbed by a potential | 1969-01-01 | Paper |
| Riesz operators and Fredholm perturbations | 1968-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5559853 | 1968-01-01 | Paper |
| Joint spectra and interpolation of operators | 1968-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5522623 | 1967-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5533798 | 1967-01-01 | Paper |
| Intermediate extensions in 𝐿^{𝑝} | 1967-01-01 | Paper |
| Essential spectra of elliptic partial differential equations | 1967-01-01 | Paper |
| On the invariance of the essential spectrum of an arbitrary operator. II | 1967-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5519336 | 1966-01-01 | Paper |
| A Boundary Layer Phenomenon in Nonlinear Membrane Theory | 1966-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5531308 | 1966-01-01 | Paper |
| Interpolation spaces by complex methods | 1966-01-01 | Paper |
| On the essential spectrum of an arbitrary operator. I | 1966-01-01 | Paper |
| Invariance of the essential spectrum | 1965-01-01 | Paper |
| Spectral theory for operators generated by elliptic boundary problems with eigenvalue parameter in boundary conditions, I | 1965-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5329328 | 1964-01-01 | Paper |
| Systems of partial differential equations in a half‐space | 1964-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5335574 | 1964-01-01 | Paper |
| On \(L^ p\) estimates and regularity. III | 1964-01-01 | Paper |
| Spectral theory for Fredholm operators | 1963-01-01 | Paper |
| On $L^p$ Estimates and Regularity II. | 1963-01-01 | Paper |
| On L p Estimates and Regularity, I | 1963-01-01 | Paper |
| Coerciveness in L p | 1963-01-01 | Paper |
| On the Dominance of Partial Differential Operators | 1963-01-01 | Paper |
| On the theory of differential boundary problems | 1963-01-01 | Paper |
| Some $L^p $ estimates for partial differential equations | 1962-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5564650 | 1961-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3280293 | 1961-01-01 | Paper |
| Observations concerning a paper of peetre | 1961-01-01 | Paper |
| Negative norms and boundary problems | 1960-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3270782 | 1960-01-01 | Paper |
| Mixed boundary problems for general elliptic equations | 1960-01-01 | Paper |
| Various types of boundary conditions for elliptic equations | 1960-01-01 | Paper |
| A general approach to boundary problems | 1960-01-01 | Paper |
| On the dirichlet problem for second order elliptic equations with coefficients singular at the boundary | 1960-01-01 | Paper |
| Elliptic problems in which the boundary conditions do not form a normal set | 1960-01-01 | Paper |
| General boundary value problems for elliptic partial differential equations | 1959-01-01 | Paper |
| General boundary value problems for elliptic partial differential equations | 1959-01-01 | Paper |
| Solution of the dirichlet problem for systems not necessarily strongly elliptic | 1959-01-01 | Paper |
| A Free Boundary Problem for Pseudo-Analytic Functions | 1959-01-01 | Paper |
| Integral inequalities for partial differential operators and functions satisfying general boundary conditions | 1959-01-01 | Paper |
| Remarks on elliptic boundary value problems | 1959-01-01 | Paper |
| Solution of the Dirichlet problem for equations not necessarily strongly elliptic | 1958-01-01 | Paper |
| Coerciveness of linear partial differential operators for functions satisfying zero dirichlet-type boundary data | 1958-01-01 | Paper |
| On Estimating Elliptic Partial Differential Operators in the L 2 Norm | 1957-01-01 | Paper |
