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@article{DE_1969_5_5_a6, author = {N. G. Bulgakov}, title = {On the question of stability under constantly acting perturbations}, journal = {Differencialʹnye uravneni\^a}, pages = {856--861}, publisher = {mathdoc}, volume = {5}, number = {5}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1969_5_5_a6/} }
N. G. Bulgakov. On the question of stability under constantly acting perturbations. Differencialʹnye uravneniâ, Tome 5 (1969) no. 5, pp. 856-861. http://geodesic.mathdoc.fr/item/DE_1969_5_5_a6/