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@article{DE_1972_8_5_a1, author = {Yu. P. Boglaev}, title = {On the theory of singularly perturbed problems with branch points for degenerate equations}, journal = {Differencialʹnye uravneni\^a}, pages = {762--766}, publisher = {mathdoc}, volume = {8}, number = {5}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1972_8_5_a1/} }
Yu. P. Boglaev. On the theory of singularly perturbed problems with branch points for degenerate equations. Differencialʹnye uravneniâ, Tome 8 (1972) no. 5, pp. 762-766. http://geodesic.mathdoc.fr/item/DE_1972_8_5_a1/