TY  - BOOK
AU  - Kato, Tosio
TI  - A short introduction to perturbation theory for linear operators
U1  - 515.72 
PY  - 1982///
CY  - New York
PB  - Springer-Verlag
N1  - "Slightly expanded version of chapters 1 & 2 of Tosio Kato 'Perturbation theory for linear operators, 2nd ed.'"
ER  -