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@article{DE_1980_16_1_a13, author = {S. G. Pyatkov}, title = {An equation of composite type}, journal = {Differencialʹnye uravneni\^a}, pages = {117--123}, publisher = {mathdoc}, volume = {16}, number = {1}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1980_16_1_a13/} }
S. G. Pyatkov. An equation of composite type. Differencialʹnye uravneniâ, Tome 16 (1980) no. 1, pp. 117-123. http://geodesic.mathdoc.fr/item/DE_1980_16_1_a13/