| Publication | Date of Publication | Type |
|---|
| Periodic differential operators | 2012-09-25 | Paper |
| Generalised Meissner Equations with an Eigenvalue-inducing Interface | 2012-09-20 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5852498 | 2010-01-27 | Paper |
| Estimates for the lowest eigenvalue of a star graph | 2009-05-13 | Paper |
| Conditions for the spectrum associated with an asymptotically straight leaky wire to comprise the interval (−∞, ∞) | 2009-02-16 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3545438 | 2008-12-10 | Paper |
| Conditions for the spectrum associated with an asymptotically straight leaky wire to contain an interval \([-\alpha^{2}/4, \infty)\) | 2008-07-25 | Paper |
| Asymptotics of the spectral density for radial Dirac operators with divergent potentials | 2008-06-18 | Paper |
| Titchmarsh's asymptotic formula for periodic eigenvalues and an extension to the \(p\)-Laplacian | 2008-03-05 | Paper |
| Eigenvalues of the radial \(p\)-Laplacian with a potential on \((0,\infty)\) | 2007-09-18 | Paper |
| Bounds for the positive eigenvalues of the \(p\)-Laplacian with decaying potential | 2006-12-07 | Paper |
| A Liouville-Green estimate for a class of differential systems | 2006-11-15 | Paper |
| Extensions of the Kummer evaluation of a finite hypergeometric series | 2006-06-16 | Paper |
| A note on the Dixon formula for a finite hypergeometric series | 2006-06-16 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3365706 | 2006-01-23 | Paper |
| Absence of high-energy spectral concentration for Dirac systems with divergent potentials | 2006-01-03 | Paper |
| Extended Hurwitz results for hypergeometric functions arising in spectral theory | 2004-08-10 | Paper |
| The Hurwitz theorem for Bessel functions and antibound states in spectral theory | 2004-08-06 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4462273 | 2004-05-18 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4441336 | 2004-01-07 | Paper |
| Analytic continuation and resonance-free regions for Sturm-Liouville potentials with power decay | 2003-02-23 | Paper |
| The convexity of the spectral function in Sturm–Liouville problems | 2002-12-15 | Paper |
| On the location of resonances of exponentially decaying Sturm-Liouville potentials | 2002-12-10 | Paper |
| ANTIBOUND STATES AND EXPONENTIALLY DECAYING STURM–LIOUVILLE POTENTIALS | 2002-10-22 | Paper |
| Asymptotic solution of differential systems with matrix coefficient containing an odd periodic factor | 2001-09-10 | Paper |
| A connection formula for Sturm—Liouville spectral functions | 2001-05-10 | Paper |
| Asymptotic Solution of a Differential System Related to the Generalized Hypergeometric Equation | 2000-10-03 | Paper |
| Spectral Concentration for Perturbed Equations of Harmonic Oscillator Type | 2000-09-25 | Paper |
| On the location of spectral concentration for perturbed discrete spectra | 2000-08-08 | Paper |
| Inequalities among eigenvalues of Sturm-Liouville problems | 1999-10-04 | Paper |
| Welsh eigenvalues of radially periodic Schrödinger operators | 1999-07-12 | Paper |
| On the location of spectral concentration for Sturm–Liouville problems with rapidly decaying potential | 1998-11-03 | Paper |
| The asymptotic form of the spectral function in Sturm–Liouville problems with a large potential like −xc(c ≦ 2) | 1998-10-11 | Paper |
| The asymptotic nature of spectral functions in Sturm-Liouville problems with continuous spectrum | 1998-09-21 | Paper |
| Using the SLEDGE package on Sturm-Liouville problems having nonempty essential spectra | 1998-04-02 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4852486 | 1995-10-31 | Paper |
| Higher-order differential equations with a slowly decaying coefficient containing a periodic factor | 1995-10-03 | Paper |
| Repeated diagonalization and the numerical computation of the Titchmarsh-Weyl m (λ)-function | 1995-02-19 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4694338 | 1993-08-17 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3992443 | 1992-09-17 | Paper |
| RESONANT PERTURBATIONS OF HIGHER-ORDER HARMONIC OSCILLATION | 1992-08-13 | Paper |
| THE NUMBER OF RESONANT STATES IN PERTURBED HARMONIC OSCILLATION | 1991-01-01 | Paper |
| Asymptotic solution of differential equations with small oscillatory coefficients | 1991-01-01 | Paper |
| Higher-Order Differential Equations with Small Oscillatory Coefficients | 1989-01-01 | Paper |
| Non-resonance for linear differential systems | 1989-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3831302 | 1988-01-01 | Paper |
| Reeated Diagonalization and Extended Liouville-Green Asymptotic Formulae | 1987-01-01 | Paper |
| A repeated transformation in the asymptotic solution of linear differential systems | 1986-01-01 | Paper |
| Resonant Perturbations of Harmonic Oscillation | 1986-01-01 | Paper |
| The asymptotic solution of linear differential systems | 1985-01-01 | Paper |
| On the eigenvectors for a class of matrices arising from quasi-derivatives | 1984-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3345140 | 1984-01-01 | Paper |
| Square-integrable solutions of a matrix differential expression | 1983-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3039744 | 1983-01-01 | Paper |
| Asymptotic Formulae of Liouville-Green Type for Higher-Order Differential Equations | 1983-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3952468 | 1982-01-01 | Paper |
| Asymptotic theory for a critical class of fourth-order differential equations | 1982-01-01 | Paper |
| On the number of solutions of right-definite problems with a convergent Dirichlet integral | 1982-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4740210 | 1982-01-01 | Paper |
| The Deficiency Index of Even-Order Differential Equations | 1982-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3660138 | 1981-01-01 | Paper |
| The Deficiency Index of a Second-Order Differential System | 1981-01-01 | Paper |
| Asymptotic Theory and Deficiency Indices for Higher-Order Self-Adjoint Differential Equations | 1981-01-01 | Paper |
| Asymptotic theory and deficiency indices for differential equations of odd order | 1981-01-01 | Paper |
| The existence of eigenvalues of infinite multiplicity for the Schrödinger operator | 1980-01-01 | Paper |
| The Limit-2n Case of Symmetric Differential Operators of Order 2n | 1979-01-01 | Paper |
| The limit-point, limit-circle nature of rapidly oscillating potentials | 1977-01-01 | Paper |
| Second-order differential expressions whose squares are limit-3 | 1977-01-01 | Paper |
| Gaps in the Essential Spectrum of Even-Order Self-Adjoint Differential Operators | 1977-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4126684 | 1977-01-01 | Paper |
| The existence of eigenvalues embedded in the continuous spectrum of ordinary differential operators | 1977-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4150020 | 1977-01-01 | Paper |
| The limit-4 case of fourth-order self-adjoint differential equations | 1977-01-01 | Paper |
| The essential self-adjointness of Schrödinger-type operators | 1976-01-01 | Paper |
| 18.—Asymptotic Estimates for the Lengths of the Gaps in the Essential Spectrum of Self-adjoint Differential Operators | 1976-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4112239 | 1976-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4119473 | 1976-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4120865 | 1975-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4059835 | 1974-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4100368 | 1974-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4771279 | 1974-01-01 | Paper |
| The Limit-3 Case of Self-Adjoint Differential Expressions of the Fourth Order with Oscillating Coefficients | 1974-01-01 | Paper |
| LIMIT-CIRCLE DIFFERENTIAL EXPRESSIONS OF THE SECOND ORDER WITH AN OSCILLATING COEFFICIENT | 1973-01-01 | Paper |
| The Picone identity for self‐adjoint differential equations of even order | 1973-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4774804 | 1973-01-01 | Paper |
| ON THE LIMIT-POINT, LIMIT-CIRCLE CLASSIFICATION OF SECOND-ORDER ORDINARY DIFFERENTIAL EQUATIONS | 1973-01-01 | Paper |
| The First Stability Interval of the Periodic Schrödinger Equation | 1972-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5648716 | 1972-01-01 | Paper |
| The Periodic Schrödinger Equation and the Brillouin Zone | 1972-01-01 | Paper |
| On a Limit-Point Method of Hartman | 1972-01-01 | Paper |
| On the L 2 Classification of Fourth-Order Differential Equations | 1971-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5631535 | 1971-01-01 | Paper |
| THE LIMIT-2 CASE OF FOURTH-ORDER DIFFERENTIAL EQUATIONS | 1971-01-01 | Paper |
| The Spectrum of Differential Operators with Large Coefficients | 1970-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5585735 | 1970-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5591659 | 1970-01-01 | Paper |
| Conditions for the Spectrum in Eigenfunction Theory to be Bounded below and Discrete for λ < 0 II | 1969-01-01 | Paper |
| On the Gaps in the Spectrum Associated with Hill's Equation | 1969-01-01 | Paper |
| On the Limit Points of the Spectrum | 1968-01-01 | Paper |
| CONDITIONS FOR THE SPECTRUM IN EIGENFUNCTION THEORY TO CONSIST OF(−∞,∞) | 1967-01-01 | Paper |
| GAPS IN THE ESSENTIAL SPECTRUM ASSOCIATED WITH SINGULAR DIFFERENTIAL OPERATORS | 1967-01-01 | Paper |
| On the Discreteness of the Spectrum in Eigenfunction Theory | 1967-01-01 | Paper |
| Conditions for the Spectrum in Eigenfunction Theory to be Bounded below and Discrete for λ < 0 | 1967-01-01 | Paper |
| A SHORT PROOF OF A THEOREM IN EIGENFUNCTION THEORY | 1966-01-01 | Paper |
| A CONDITION FOR THE SPECTRUM IN EIGENFUNCTION THEORY TO CONTAIN [0, ∞) | 1966-01-01 | Paper |
| ON THE DISCRETENESS OF THE SPECTRUM IN AN EIGENVALUE PROBLEM | 1965-01-01 | Paper |
| Two Counter-Examples in the Theory of Eigenfunctions | 1965-01-01 | Paper |
| The Representation of Lines by Dual Vectors | 1965-01-01 | Paper |
| On the Nature of the Spectrum in the Theory of Eigenfunctions | 1965-01-01 | Paper |
| On polylogarithms | 1964-01-01 | Paper |
| THE DISTRIBUTION OF THE EIGENVALUES IN CERTAIN EIGENVALUE PROBLEMS | 1964-01-01 | Paper |
| A PROPERTY OF CONJUGATE FUNCTIONS | 1963-01-01 | Paper |
| EIGENVALUE PROBLEMS WITH THE PARAMETER IN THE BOUNDARY CONDITION | 1963-01-01 | Paper |
| On harmonic continuation | 1963-01-01 | Paper |
| ON HILBERT TRANSFORMS | 1962-01-01 | Paper |
| AN EIGENVALUE PROBLEM WITH THE PARAMETER IN THE BOUNDARY CONDITION | 1962-01-01 | Paper |
| 2927. A method of calculating some natural logarithms | 1960-01-01 | Paper |
