@article{ASNSP_1977_4_4_4_725_0, author = {Hamada, Y\^usaku and Nakamura, Gen}, title = {On the singularities of the solution of the {Cauchy} problem for the operator with non uniform multiple characteristics}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {725--755}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 4}, number = {4}, year = {1977}, zbl = {0373.35010}, mrnumber = {508973}, language = {en}, url = {http://www.numdam.org/item/ASNSP_1977_4_4_4_725_0/} }