TY  - BOOK
AU  - Gould S H
TI  - Variational methods for eigenvalue problems : an introduction to the methods of Rayleigh, Ritz, Weinstein, and Aronszajn
U1  - 515.64 
PY  - 1957///
CY  - Toronto
PB  - University Press
KW  - Calculus
ER  -