@article{ZVMMF_1964_4_14_a4,
     author = {K. G. Valeev and J. V. Rakitskii},
     title = {On the determination by difference methods of regions of instability of the solutions of a system of linear differential equations},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {110--122},
     year = {1964},
     volume = {4},
     number = {14},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1964_4_14_a4/}
}