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@article{DE_1968_4_12_a6, author = {Yu. S. Shatalov}, title = {A certain method of investigating singular problems}, journal = {Differencialʹnye uravneni\^a}, pages = {2215--2229}, publisher = {mathdoc}, volume = {4}, number = {12}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1968_4_12_a6/} }
Yu. S. Shatalov. A certain method of investigating singular problems. Differencialʹnye uravneniâ, Tome 4 (1968) no. 12, pp. 2215-2229. http://geodesic.mathdoc.fr/item/DE_1968_4_12_a6/