On some problems in the theory of eigenvalues and eigenfunctions associated with linear elliptic partial differential equations of the second order

Instytut Matematyczny Polskiej Akademii Nauk / Institute of Mathematics / Publishing house / Journals and Serials / Annales Polonici Mathematici / All issues

Jan Bochenek Annales Polonici Mathematici 16 (1965), 153-167 DOI: 10.4064/ap-16-2-153-167