@article{1250522062,
author = {Matsumoto, Waichiro},
title = {On the condition for the hyperbolicity of systems with double characteristic roots, II},
journal = {J. Math. Kyoto Univ.},
volume = {21},
number = {4},
year = {1981},
pages = { 251-271},
language = {en},
url = {http://dml.mathdoc.fr/item/1250522062}
}
Matsumoto, Waichiro. On the condition for the hyperbolicity of systems with double characteristic roots, II. J. Math. Kyoto Univ., Tome 21 (1981) no. 4, pp. 251-271. http://gdmltest.u-ga.fr/item/1250522062/