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@article{DAN_1967_172_2_a5, author = {V. B. Korotkov}, title = {$T$-invariance of the coefficients of quasi-linear hyperbolic equations}, journal = {Doklady Akademii Nauk}, pages = {271--274}, publisher = {mathdoc}, volume = {172}, number = {2}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_2_a5/} }
V. B. Korotkov. $T$-invariance of the coefficients of quasi-linear hyperbolic equations. Doklady Akademii Nauk, Tome 172 (1967) no. 2, pp. 271-274. http://geodesic.mathdoc.fr/item/DAN_1967_172_2_a5/