Introduction to the theory of linear nonselfadjoint operators, by I. C. Gohberg [and] M. G. Kreĭn. [Translated from the Russian by A. Feinstein]. (Translations of mathematical monographs, v. 18)
Introduction to the theory of linear nonselfadjoint operators, by I. C. Gohberg [and] M. G. Kreĭn. [Translated from the Russian by A. Feinstein].