Numerical range of operator pencils and keldysh multiple completeness
Funkcionalʹnyj analiz i ego priloženiâ, Tome 9 (1975) no. 1, pp. 31-34.

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G. A. Isaev. Numerical range of operator pencils and keldysh multiple completeness. Funkcionalʹnyj analiz i ego priloženiâ, Tome 9 (1975) no. 1, pp. 31-34. http://geodesic.mathdoc.fr/item/FAA_1975_9_1_a4/

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