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@article{DAN_1989_304_5_a2, author = {V. I. Vasyunin}, title = {Multiplicity of a spectrum of contractions with finite defect}, journal = {Doklady Akademii Nauk}, pages = {1041--1043}, publisher = {mathdoc}, volume = {304}, number = {5}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_304_5_a2/} }
V. I. Vasyunin. Multiplicity of a spectrum of contractions with finite defect. Doklady Akademii Nauk, Tome 304 (1989) no. 5, pp. 1041-1043. http://geodesic.mathdoc.fr/item/DAN_1989_304_5_a2/