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@article{DAN_1978_242_1_a12, author = {V. P. Shatskii}, title = {On hyperbolic systems with two planes of singularities}, journal = {Doklady Akademii Nauk}, pages = {56--59}, publisher = {mathdoc}, volume = {242}, number = {1}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1978_242_1_a12/} }
V. P. Shatskii. On hyperbolic systems with two planes of singularities. Doklady Akademii Nauk, Tome 242 (1978) no. 1, pp. 56-59. http://geodesic.mathdoc.fr/item/DAN_1978_242_1_a12/