Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1969_13_1_a5, author = {L. V. H\"ormander}, title = {On the characteristic {Cauchy} problem}, journal = {Matematika}, pages = {83--110}, publisher = {mathdoc}, volume = {13}, number = {1}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1969_13_1_a5/} }
L. V. Hörmander. On the characteristic Cauchy problem. Matematika, Tome 13 (1969) no. 1, pp. 83-110. http://geodesic.mathdoc.fr/item/MAT_1969_13_1_a5/