@article{1250523767,
author = {Sakamoto, Reiko},
title = {Mixed problems for hyperbolic equations I Energy inequalities},
journal = {J. Math. Kyoto Univ.},
volume = {10},
number = {2},
year = {1970},
pages = { 349-373},
language = {en},
url = {http://dml.mathdoc.fr/item/1250523767}
}
Sakamoto, Reiko. Mixed problems for hyperbolic equations I Energy inequalities. J. Math. Kyoto Univ., Tome 10 (1970) no. 2, pp. 349-373. http://gdmltest.u-ga.fr/item/1250523767/