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@article{DAN_1964_157_4_a9, author = {A. I. Perov}, title = {Topological characteristics of solutions of higher-dimensional differential equations}, journal = {Doklady Akademii Nauk}, pages = {791--794}, publisher = {mathdoc}, volume = {157}, number = {4}, year = {1964}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1964_157_4_a9/} }
A. I. Perov. Topological characteristics of solutions of higher-dimensional differential equations. Doklady Akademii Nauk, Tome 157 (1964) no. 4, pp. 791-794. http://geodesic.mathdoc.fr/item/DAN_1964_157_4_a9/