@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/}
}