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@article{DE_1977_13_7_a7, author = {V. Kh. Froim}, title = {A system of equations that are degenerate on the plane}, journal = {Differencialʹnye uravneni\^a}, pages = {1218--1224}, publisher = {mathdoc}, volume = {13}, number = {7}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1977_13_7_a7/} }
V. Kh. Froim. A system of equations that are degenerate on the plane. Differencialʹnye uravneniâ, Tome 13 (1977) no. 7, pp. 1218-1224. http://geodesic.mathdoc.fr/item/DE_1977_13_7_a7/