TY  - BOOK
AU  - Levitan B M
AU  - Sargsjan I S
TI  - Introduction to spectral theory: self adjoint ordinary differential operators
U1  - 510TM 
PY  - 1975///
CY  - Providence
PB  - AMS
KW  - Differential theory
KW  - Mathematics
KW  - Spectral theory
ER  -