Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1970_195_4_a5, author = {A. M. Nakhushev}, title = {The {Darboux} problem for hyperbolic equations}, journal = {Doklady Akademii Nauk}, pages = {776--779}, publisher = {mathdoc}, volume = {195}, number = {4}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_195_4_a5/} }
A. M. Nakhushev. The Darboux problem for hyperbolic equations. Doklady Akademii Nauk, Tome 195 (1970) no. 4, pp. 776-779. http://geodesic.mathdoc.fr/item/DAN_1970_195_4_a5/