O локализации собственных чисел одной спектральной задачи.
On a certain boundary value problem for a fourth-order iterated differential equation
On a certain modification of Sturm's comparison theorem
On a non-self adjoint eigenfunction expansion.
On a non-self adjoint expansion formula.
On convergence of orthogonal series of Bessel functions
On some applications of Bochner-Schoenberg-Eberlein type theorems
On the canonical development of Parseval formulas for singular differential operators
Per funzioni opportune si ottiene una formula di Parseval per operatori differenziali singolari di tipo dell'operatore radiale di Laplace-Beltrami. è una funzione spettrale generalizzata di tipo Marčenko e può essere rappresentata per mezzo di un certo nucleo della trasmutazione.
On the completeness of eigenfunctions and associated functions of irregular multipoint eigenvalue-problems.
On the convergence of biorthogonal series corresponding to nonselfadjoint Sturm-Liouville operator with discontinuous coefficients.
On the convergence of expansions with respect to eigen-and adjoint functions of a non-self-adjoint Sturm-Liouville type operator with discontinuous coefficients.
On the Eigenvalues of Nonselfadjoint Problems Involving Indefinite Weights.
On the genericity of nonvanishing instability intervals in Hills equation
On the monotonicity of nonnegative solutions and the uniqueness of eigenvalues
On the sensitivity of the matrix exponential problem
On the Solutions of (ry')' + qy = f.
One-dimensional Schrödinger operators with interactions singular on a discrete set.
Original title unknown
Oscillateur quartique et méthodes semi-classiques