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@article{DAN_1962_146_4_a9, author = {P. E. Sobolevskii}, title = {On second-order differential equations in a {Banach} space}, journal = {Doklady Akademii Nauk}, pages = {774--777}, publisher = {mathdoc}, volume = {146}, number = {4}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_146_4_a9/} }
P. E. Sobolevskii. On second-order differential equations in a Banach space. Doklady Akademii Nauk, Tome 146 (1962) no. 4, pp. 774-777. http://geodesic.mathdoc.fr/item/DAN_1962_146_4_a9/