@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},
     mrnumber = {508973},
     zbl = {0373.35010},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1977_4_4_4_725_0/}
}