A class of pseudo differential operators with multiple non-involutive characteristics
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 8 (1981) no. 4, pp. 575-603. 
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     title = {A class of pseudo differential operators with multiple non-involutive characteristics},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
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     volume = {Ser. 4, 8},
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     year = {1981},
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     zbl = {0441.35069},
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     url = {http://archive.numdam.org/item/ASNSP_1981_4_8_4_575_0/}
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Mascarello Rodino, Maria; Rodino, Luigi. A class of pseudo differential operators with multiple non-involutive characteristics. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 8 (1981) no. 4, pp. 575-603. http://archive.numdam.org/item/ASNSP_1981_4_8_4_575_0/

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