@article{DAN_1972_207_2_a8,
     author = {V. V. Katrakhov},
     title = {An eigenvalue problem for singular elliptic operators},
     journal = {Doklady Akademii Nauk},
     pages = {284--287},
     publisher = {mathdoc},
     volume = {207},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_207_2_a8/}
}