![Autovalori E Autosoluzioni: Lectures Given at a... [Italian] 3642109926 Book Cover](https://i.thriftbooks.com/api/imagehandler/l/76060F1C56845ADC5B4E98AEE83BA6D12EFD891B.jpeg)
S. Agmon: On eigenvalues, eigenfunctions, and resolvents of general elliptic problems.- A. Ostrowski: Il metodo del quoziente di Rayleigh.- L.E. Payne: Isoperimetric inequalities for eigenvalues and their applications.- L. De Vito: Calcolo degli autovalori e delle autosoluzioni...