Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1970_194_1_a6, author = {A. M. Nakhushev}, title = {A multidimensional analogue of the problem of {Darboux} for hyperbolic equations}, journal = {Doklady Akademii Nauk}, pages = {31--34}, publisher = {mathdoc}, volume = {194}, number = {1}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_194_1_a6/} }
A. M. Nakhushev. A multidimensional analogue of the problem of Darboux for hyperbolic equations. Doklady Akademii Nauk, Tome 194 (1970) no. 1, pp. 31-34. http://geodesic.mathdoc.fr/item/DAN_1970_194_1_a6/