@article{ASNSP_1983_4_10_2_291_0, author = {Colombini, F. and Jannelli, E. and Spagnolo, S.}, title = {Well-posedness in the {Gevrey} classes of the {Cauchy} problem for a non-strictly hyperbolic equation with coefficients depending on time}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {291--312}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 10}, number = {2}, year = {1983}, zbl = {0543.35056}, mrnumber = {728438}, language = {en}, url = {http://www.numdam.org/item/ASNSP_1983_4_10_2_291_0/} }