@article{1195518834,
author = {Yoshida, Kiyoshi},
title = {Energy inequalities and finite propagation speed of the Cauchy problem for hyperbolic equations withconstantly multiple characteristics},
journal = {Proc. Japan Acad.},
volume = {50},
number = {1},
year = {1974},
pages = { 561-565},
language = {en},
url = {http://dml.mathdoc.fr/item/1195518834}
}
Yoshida, Kiyoshi. Energy inequalities and finite propagation speed of the Cauchy problem for hyperbolic equations withconstantly multiple characteristics. Proc. Japan Acad., Tome 50 (1974) no. 1, pp. 561-565. http://gdmltest.u-ga.fr/item/1195518834/