Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1982_267_4_a8, author = {M. V. Fedoryuk}, title = {A {Sturm--Liouville} problem with regular singularities}, journal = {Doklady Akademii Nauk}, pages = {800--803}, publisher = {mathdoc}, volume = {267}, number = {4}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1982_267_4_a8/} }
M. V. Fedoryuk. A Sturm--Liouville problem with regular singularities. Doklady Akademii Nauk, Tome 267 (1982) no. 4, pp. 800-803. http://geodesic.mathdoc.fr/item/DAN_1982_267_4_a8/