@article{1195514636,
author = {Nishitani, Tatsuo},
title = {On strong hyperbolicity for first order systems},
journal = {Proc. Japan Acad. Ser. A Math. Sci.},
volume = {61},
number = {7},
year = {1985},
pages = { 193-196},
language = {en},
url = {http://dml.mathdoc.fr/item/1195514636}
}
Nishitani, Tatsuo. On strong hyperbolicity for first order systems. Proc. Japan Acad. Ser. A Math. Sci., Tome 61 (1985) no. 7, pp. 193-196. http://gdmltest.u-ga.fr/item/1195514636/