Perturbation theory for linear operators /
[by] Tosio Kato.
- 2nd ed.
- Berlin : Springer, c1995.
- xxi, 619 p. ; 24 cm.
- Grundlehren der mathematischen Wissenschaften; 132 .
Originally published: 2nd ed. Berlin ; New York : Springer-Verlag, 1976 (1980 printing).