@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/}
}