@article{1250523237,
author = {Kajitani, Kunihiko},
title = {A necessary condition for the well posed hyperbolic mixed problem with variable coefficients},
journal = {J. Math. Kyoto Univ.},
volume = {14},
number = {3},
year = {1974},
pages = { 231-242},
language = {en},
url = {http://dml.mathdoc.fr/item/1250523237}
}
Kajitani, Kunihiko. A necessary condition for the well posed hyperbolic mixed problem with variable coefficients. J. Math. Kyoto Univ., Tome 14 (1974) no. 3, pp. 231-242. http://gdmltest.u-ga.fr/item/1250523237/