@article{ZVMMF_1980_20_4_a10,
     author = {L. Aleksandrov and D. Karadzhov},
     title = {Approximate solution of eigenvalue problems for high-order linear differential equations},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {923--938},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1980_20_4_a10/}
}