@article{1250522320, author = {Igari, Katsuju}, title = {Cauchy problem for weakly hyperbolic equations of second order}, journal = {J. Math. Kyoto Univ.}, volume = {20}, number = {4}, year = {1980}, pages = { 43-55}, language = {en}, url = {http://dml.mathdoc.fr/item/1250522320} }
Igari, Katsuju. Cauchy problem for weakly hyperbolic equations of second order. J. Math. Kyoto Univ., Tome 20 (1980) no. 4, pp. 43-55. http://gdmltest.u-ga.fr/item/1250522320/