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@article{DAN_1987_293_2_a8, author = {N. Yu. Kapustin}, title = {On two problems for a hyperbolic equation in the characteristic}, journal = {Doklady Akademii Nauk}, pages = {301--305}, publisher = {mathdoc}, volume = {293}, number = {2}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1987_293_2_a8/} }
N. Yu. Kapustin. On two problems for a hyperbolic equation in the characteristic. Doklady Akademii Nauk, Tome 293 (1987) no. 2, pp. 301-305. http://geodesic.mathdoc.fr/item/DAN_1987_293_2_a8/