Differential equations on contact riemannian manifolds
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 30 (2001) no. 1, pp. 63-95. 
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Barletta, Elisabetta; Dragomir, Sorin. Differential equations on contact riemannian manifolds. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 30 (2001) no. 1, pp. 63-95. http://archive.numdam.org/item/ASNSP_2001_4_30_1_63_0/

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