On the theorem of Frobenius for complex vector fields
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 9 (1982) no. 1, pp. 57-90. 
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     author = {Stormark, Olle},
     title = {On the theorem of {Frobenius} for complex vector fields},
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Stormark, Olle. On the theorem of Frobenius for complex vector fields. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 9 (1982) no. 1, pp. 57-90. http://www.numdam.org/item/ASNSP_1982_4_9_1_57_0/

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