Journal of Operator Theory
Volume 9, Issue 2, Spring 1983 pp. 297-317.
Perturbation theory for definitizable operators in Krein spacesAuthors: Heinz Langer (1) and Branko Najman (2)
Author institution: (1) Sektion Mathematik, Technische Univesitaet Dresden, 8027 Dresden, DDR.
(2) Department of Mathematics, University of Zagreb, PO Box 187. 41000 Zagreb, Yugoslavia.
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