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@article{MZM_1983_34_6_a7, author = {V. G. Dolgolaptev}, title = {Basicity of the root vectors of weakly perturbed operators}, journal = {Matemati\v{c}eskie zametki}, pages = {867--872}, publisher = {mathdoc}, volume = {34}, number = {6}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1983_34_6_a7/} }
V. G. Dolgolaptev. Basicity of the root vectors of weakly perturbed operators. Matematičeskie zametki, Tome 34 (1983) no. 6, pp. 867-872. http://geodesic.mathdoc.fr/item/MZM_1983_34_6_a7/