@article{ZVMMF_1991_31_4_a16,
     author = {A. V. Shcheprov},
     title = {Letter to the editor},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {639},
     publisher = {mathdoc},
     volume = {31},
     number = {4},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1991_31_4_a16/}
}