TY  - BOOK
AU  - Friedrichs K O
TI  - Spectral theory of operators in hilbert space
T2  - Applied mathematical Sciences; 9
U1  - B313N, L3 
PY  - 1973///
CY  - New York    
PB  -  Springer Verlag       
KW  -  Spectral theory
KW  - Hilbert Science
ER  -