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@article{DAN_1961_136_6_a1, author = {Yu. G. Borisovich}, title = {A weak topology and periodical solutions of differential equations}, journal = {Doklady Akademii Nauk}, pages = {1269--1272}, publisher = {mathdoc}, volume = {136}, number = {6}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_136_6_a1/} }
Yu. G. Borisovich. A weak topology and periodical solutions of differential equations. Doklady Akademii Nauk, Tome 136 (1961) no. 6, pp. 1269-1272. http://geodesic.mathdoc.fr/item/DAN_1961_136_6_a1/