@article{DE_1973_9_5_a15,
     author = {B. A. Bel'tyukov and N. N. Kochetkov},
     title = {The method of {Volterra} integral equations in eigenvalue problems with several parameters},
     journal = {Differencialʹnye uravneni\^a},
     pages = {922--930},
     publisher = {mathdoc},
     volume = {9},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_5_a15/}
}