@article{DE_1983_19_2_a8,
     author = {M. V. Fedoryuk},
     title = {The {Sturm--Liouville} problem with regular singular {points.~II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {278--286},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_2_a8/}
}