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@article{IVM_1986_8_a11, author = {V. A. Sochneva and V. R. Fridlender}, title = {A generalization of the {Goursat} problem}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {63--70}, publisher = {mathdoc}, number = {8}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1986_8_a11/} }
V. A. Sochneva; V. R. Fridlender. A generalization of the Goursat problem. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1986), pp. 63-70. http://geodesic.mathdoc.fr/item/IVM_1986_8_a11/