On Isometries and on a Theorem of Liouville.
Uniqueness of Principal Values, Complete Monotonicity of Logarithmic Derivatives of Principal Solutions, and Oscillation Theorems.
On solutions of ...V+V = 0 in an exterior region.
On the monotonicity of nonnegative solutions and the uniqueness of eigenvalues
Logarithmic derivatives of solutions of disconjugate differential equations
Completely monotone families of solutions of -th order linear differential equations and infinitely divisible distributions
Errata-Corrige : “Completely monotone families of solutions of -th order linear differential equations and infinitely divisible distributions”
On oscillators with large frequencies.
On the ratio .
On solutions of the Helmholtz equation in exterior domains.
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