@article{1206137316,
author = {Yoshida, Kiyoshi},
title = {On the Cauchy problem for linear hyperbolic differential equations with multiple characteristics and constant leading coefficients},
journal = {Hiroshima Math. J.},
volume = {3},
number = {2},
year = {1973},
pages = { 419-438},
language = {en},
url = {http://dml.mathdoc.fr/item/1206137316}
}
Yoshida, Kiyoshi. On the Cauchy problem for linear hyperbolic differential equations with multiple characteristics and constant leading coefficients. Hiroshima Math. J., Tome 3 (1973) no. 2, pp. 419-438. http://gdmltest.u-ga.fr/item/1206137316/