@article{DAN_1976_231_2_a4,
     author = {N. I. Kipriyanova},
     title = {On expansions in the eigenfunctions of some singular differential operators},
     journal = {Doklady Akademii Nauk},
     pages = {281--284},
     publisher = {mathdoc},
     volume = {231},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_231_2_a4/}
}