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@article{DE_1982_18_12_a7, author = {M. V. Fedoryuk}, title = {The {Sturm-Liouville} problem with regular singular {points.~I}}, journal = {Differencialʹnye uravneni\^a}, pages = {2166--2173}, publisher = {mathdoc}, volume = {18}, number = {12}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1982_18_12_a7/} }
M. V. Fedoryuk. The Sturm-Liouville problem with regular singular points.~I. Differencialʹnye uravneniâ, Tome 18 (1982) no. 12, pp. 2166-2173. http://geodesic.mathdoc.fr/item/DE_1982_18_12_a7/