@article{DE_1978_14_3_a25,
     author = {V. A. Andrunakievich and N. P. Erugin and Yu. S. Bogdanov},
     title = {Konstantin {Sergeevi{\v{c}}} {Sibirski{\v\i}} (on the occasion of his fiftieth birthday)},
     journal = {Differencialʹnye uravneni\^a},
     pages = {565--570},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_3_a25/}
}