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@article{DE_1974_10_6_a4, author = {G. S. Osipenko}, title = {The problems of {Frommer}}, journal = {Differencialʹnye uravneni\^a}, pages = {1015--1024}, publisher = {mathdoc}, volume = {10}, number = {6}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1974_10_6_a4/} }
G. S. Osipenko. The problems of Frommer. Differencialʹnye uravneniâ, Tome 10 (1974) no. 6, pp. 1015-1024. http://geodesic.mathdoc.fr/item/DE_1974_10_6_a4/