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@article{DAN_1989_306_2_a6, author = {R. K. Romanovskii}, title = {Averaging hyperbolic equations}, journal = {Doklady Akademii Nauk}, pages = {286--289}, publisher = {mathdoc}, volume = {306}, number = {2}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_306_2_a6/} }
R. K. Romanovskii. Averaging hyperbolic equations. Doklady Akademii Nauk, Tome 306 (1989) no. 2, pp. 286-289. http://geodesic.mathdoc.fr/item/DAN_1989_306_2_a6/