Singular Elliptic Operators of Second Order with Purely Discrete Spectra

Autor:	Lewis, Roger T.
Zdroj:	Transactions of the American Mathematical Society, 1982 Jun 01. 271(2), 653-666.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/1998903 Zobrazit plný text záznamu