@article{ZVMMF_1980_20_5_a6,
     author = {A. A. Abramov and V. V. Ditkin and N. B. Konyukhova and B. S. Pariiskii and V. I. Ul'yanova},
     title = {The calculation of eigenvalues and eigenfunctions of ordinary differential equations with singularities},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1155--1173},
     publisher = {mathdoc},
     volume = {20},
     number = {5},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1980_20_5_a6/}
}