Geodesic
Definite invariant subspaces and the structure of the spectrum of a focusing plus-operator
Funkcionalʹnyj analiz i ego priloženiâ, Tome 15 (1981) no. 1, pp. 84-85 
A. V. Sobolev; V. A. Khatskevich. Definite invariant subspaces and the structure of the spectrum of a focusing plus-operator. Funkcionalʹnyj analiz i ego priloženiâ, Tome 15 (1981) no. 1, pp. 84-85. http://geodesic.mathdoc.fr/item/FAA_1981_15_1_a14/
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}
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