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@article{DAN_1979_247_2_a19, author = {M. A. Grinfel'd}, title = {On the theory of ray method of the wave front investigation in nonlinear problems}, journal = {Doklady Akademii Nauk}, pages = {337--340}, publisher = {mathdoc}, volume = {247}, number = {2}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1979_247_2_a19/} }
M. A. Grinfel'd. On the theory of ray method of the wave front investigation in nonlinear problems. Doklady Akademii Nauk, Tome 247 (1979) no. 2, pp. 337-340. http://geodesic.mathdoc.fr/item/DAN_1979_247_2_a19/