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@article{DE_1982_18_2_a23, author = {T. V. Treneva}, title = {On a four-dimensional not strongly elliptic system}, journal = {Differencialʹnye uravneni\^a}, pages = {351--353}, publisher = {mathdoc}, volume = {18}, number = {2}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1982_18_2_a23/} }
T. V. Treneva. On a four-dimensional not strongly elliptic system. Differencialʹnye uravneniâ, Tome 18 (1982) no. 2, pp. 351-353. http://geodesic.mathdoc.fr/item/DE_1982_18_2_a23/