no. 1
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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     title = {Differential equations on contact riemannian manifolds},
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     pages = {63--95},
     publisher = {Scuola normale superiore},
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     mrnumber = {1882025},
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     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_2001_4_30_1_63_0/}
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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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