TY  - BOOK
AU  - Rellich, Franz.
TI  - Perturbation theory of eigenvalue problems
U1  - 517.5 REL 
PY  - 1969///
CY  - New York
PB  - Gordon and Breach
KW  - Functional analysis
KW  - Perturbation (Mathematics)
KW  - Eigenvalues
N1  - "Taken from lectures given by Professor Rellich at New York Universi ty in 1953."; Includes bibliographical references
ER  -