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@article{DE_1966_2_7_a3, author = {N. A. Izobov}, title = {Stability with respect to the first approximation}, journal = {Differencialʹnye uravneni\^a}, pages = {898--907}, publisher = {mathdoc}, volume = {2}, number = {7}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1966_2_7_a3/} }
N. A. Izobov. Stability with respect to the first approximation. Differencialʹnye uravneniâ, Tome 2 (1966) no. 7, pp. 898-907. http://geodesic.mathdoc.fr/item/DE_1966_2_7_a3/