@article{DE_1972_8_3_a9,
     author = {V. P. Gromov},
     title = {A certain class of functional equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {473--485},
     publisher = {mathdoc},
     volume = {8},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_3_a9/}
}