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@article{DE_1976_12_4_a23, author = {R. A. Prokhorova}, title = {On the question of stability with respect to the first approximation}, journal = {Differencialʹnye uravneni\^a}, pages = {766--769}, publisher = {mathdoc}, volume = {12}, number = {4}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_4_a23/} }
R. A. Prokhorova. On the question of stability with respect to the first approximation. Differencialʹnye uravneniâ, Tome 12 (1976) no. 4, pp. 766-769. http://geodesic.mathdoc.fr/item/DE_1976_12_4_a23/