Symmetric Linear Operators on a Banach Space.
On Orthogonal Polynomials with Extrema at the Ends of the Orthogonality Interval.
The Polynomial-Normaloid Property for Banach-Space Operators
Estimation of an Eigen-Value Occurring in a Stability Problem.
Über die Stirlingsche Reihe.
Asymptotics of the number of zeros and of the eigenvalues of general weighted Sturm-Liouville problems.
An extension of Milloux's theorem to half-linear differential equations.
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