@article{DE_1973_9_1_a20,
     author = {V. N. Vragov},
     title = {A certain equation of mixed-composite type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {169--171},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_1_a20/}
}