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@article{DE_1985_21_10_a12, author = {A. N. Filatov}, title = {Some problems of the theory of singularly perturbed equations}, journal = {Differencialʹnye uravneni\^a}, pages = {1726--1730}, publisher = {mathdoc}, volume = {21}, number = {10}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_10_a12/} }
A. N. Filatov. Some problems of the theory of singularly perturbed equations. Differencialʹnye uravneniâ, Tome 21 (1985) no. 10, pp. 1726-1730. http://geodesic.mathdoc.fr/item/DE_1985_21_10_a12/