no. 1
Structures localement plates isotropes des groupes de Lie
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 1, pp. 91-131. 
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Boyom, Nguiffo B. Structures localement plates isotropes des groupes de Lie. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 1, pp. 91-131. http://www.numdam.org/item/ASNSP_1993_4_20_1_91_0/

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