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@article{DAN_1960_133_4_a16, author = {B. L. Livshits}, title = {Perturbation theory for a simple structure operator}, journal = {Doklady Akademii Nauk}, pages = {800--803}, publisher = {mathdoc}, volume = {133}, number = {4}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_4_a16/} }
B. L. Livshits. Perturbation theory for a simple structure operator. Doklady Akademii Nauk, Tome 133 (1960) no. 4, pp. 800-803. http://geodesic.mathdoc.fr/item/DAN_1960_133_4_a16/