Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1977_235_5_a5, author = {V. Ya. Ivrii}, title = {Wave fronts of solutions of boundary value problems for symmetric hyperbolic systems}, journal = {Doklady Akademii Nauk}, pages = {1013--1016}, publisher = {mathdoc}, volume = {235}, number = {5}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1977_235_5_a5/} }
V. Ya. Ivrii. Wave fronts of solutions of boundary value problems for symmetric hyperbolic systems. Doklady Akademii Nauk, Tome 235 (1977) no. 5, pp. 1013-1016. http://geodesic.mathdoc.fr/item/DAN_1977_235_5_a5/