TY - BOOK AU - Katō,Tosio TI - Perturbation theory for linear operators T2 - Grundlehren der mathematischen Wissenschaften ; 132 SN - 0387075585 U1 - 515.72 KAT 19 PY - 1976/// CY - Berlin, New York PB - Springer-Verlag KW - Linear operators KW - Perturbation (Mathematics) N1 - Includes indexes; Bibliography: p. 583-605 ER -