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@article{DAN_1969_189_6_a7, author = {Yu. E. Murakhver}, title = {The velocity of a wave front}, journal = {Doklady Akademii Nauk}, pages = {1193--1196}, publisher = {mathdoc}, volume = {189}, number = {6}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_189_6_a7/} }
Yu. E. Murakhver. The velocity of a wave front. Doklady Akademii Nauk, Tome 189 (1969) no. 6, pp. 1193-1196. http://geodesic.mathdoc.fr/item/DAN_1969_189_6_a7/