On the singularities of the solution of the Cauchy problem for the operator with non uniform multiple characteristics
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 4 (1977) no. 4, pp. 725-755. 
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     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},
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Hamada, Yûsaku; Nakamura, Gen. On the singularities of the solution of the Cauchy problem for the operator with non uniform multiple characteristics. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 4 (1977) no. 4, pp. 725-755. http://archive.numdam.org/item/ASNSP_1977_4_4_4_725_0/

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