TY - BOOK AU - Katō,Tosio TI - Perturbation theory for linear operators T2 - Grundlehren der mathematischen Wissenschaften SN - 9783540586616 U1 - 515.7246 22 PY - 1976/// CY - Berlin PB - Springer-Verlag KW - Perturbation (Mathematics) KW - BUEsh KW - Linear operators KW - ENGGEN KW - August2015 KW - reading book N1 - Includes indexes; A series of comprehensive studies in mathematics; Bibliography : p. 583-605 ER -