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@article{DAN_1972_207_5_a6, author = {G. A. Kolupanova}, title = {On a differential equation of hyperbolic type in {Banach} space}, journal = {Doklady Akademii Nauk}, pages = {1044--1047}, publisher = {mathdoc}, volume = {207}, number = {5}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1972_207_5_a6/} }
G. A. Kolupanova. On a differential equation of hyperbolic type in Banach space. Doklady Akademii Nauk, Tome 207 (1972) no. 5, pp. 1044-1047. http://geodesic.mathdoc.fr/item/DAN_1972_207_5_a6/