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@article{DAN_1978_242_6_a4, author = {S. M. Ponomarev}, title = {On the {Tricomi} problem for a system of equations of mixed type in the plane}, journal = {Doklady Akademii Nauk}, pages = {1256--1257}, publisher = {mathdoc}, volume = {242}, number = {6}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1978_242_6_a4/} }
S. M. Ponomarev. On the Tricomi problem for a system of equations of mixed type in the plane. Doklady Akademii Nauk, Tome 242 (1978) no. 6, pp. 1256-1257. http://geodesic.mathdoc.fr/item/DAN_1978_242_6_a4/