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@article{DAN_1969_186_1_a5, author = {A. I. Perov}, title = {New complete solvability conditions and questions of reducibility}, journal = {Doklady Akademii Nauk}, pages = {26--29}, publisher = {mathdoc}, volume = {186}, number = {1}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_1_a5/} }
A. I. Perov. New complete solvability conditions and questions of reducibility. Doklady Akademii Nauk, Tome 186 (1969) no. 1, pp. 26-29. http://geodesic.mathdoc.fr/item/DAN_1969_186_1_a5/