Sturm-Liouville Theory
Charles Sturm and the Development of Sturm-Liouville Theory in the Years 1900 to 1950
STURM-LIOUVILLE THEORY–ORTHOGONAL FUNCTIONS
Chapter 8 Sturm-Liouville Theory
Sturm-Liouville Theory and its Applications
STURM–LIOUVILLE THEORY—ORTHOGONAL FUNCTIONS