Projective connections, double fibrations and formal neighbourhoods of lines.
Mathematische Annalen, Tome 292 (1992) no. 2, pp. 383-410.

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Mots-clés : Cartan invariants, second order differential equation, cohomology classes, formal neighbourhoods of lines, flows, twistor space, Painlevé transcendents
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     author = {N. Kamran and J.C. Hurtubise},
     title = {Projective connections, double fibrations and formal neighbourhoods of lines.},
     journal = {Mathematische Annalen},
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N. Kamran; J.C. Hurtubise. Projective connections, double fibrations and formal neighbourhoods of lines.. Mathematische Annalen, Tome 292 (1992) no. 2, pp. 383-410. http://geodesic.mathdoc.fr/item/MAN_1992__292_2_164921/