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@article{DAN_1960_135_5_a5, author = {A. A. Dezin}, title = {Invariant hyperbolic systems and the {Goursat} problem}, journal = {Doklady Akademii Nauk}, pages = {1042--1045}, publisher = {mathdoc}, volume = {135}, number = {5}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1960_135_5_a5/} }
A. A. Dezin. Invariant hyperbolic systems and the Goursat problem. Doklady Akademii Nauk, Tome 135 (1960) no. 5, pp. 1042-1045. http://geodesic.mathdoc.fr/item/DAN_1960_135_5_a5/