TY  - BOOK
AU  - Helmberg, Gilbert
AU  - Koiter, W T  [series editor]
TI  - Introduction to spectral theory in Hilbert space
U1  - 513.82 
PY  - 1969///
CY  - Amsterdam
PB  - North Holland Publishing Company
KW  - Hilbert space
KW  - Spectral theory
ER  -