Geodesic
The Cauchy problem for nonanalytic Pfaffian systems
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 6 
Yu. V. Titarenko. The Cauchy problem for nonanalytic Pfaffian systems. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 6. http://geodesic.mathdoc.fr/item/RM_1975_30_6_a24/
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     title = {The {Cauchy} problem for nonanalytic {Pfaffian} systems},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] K. Godbiion, Differentsialnaya geometriya i analiticheskaya mekhanika, gl. V, Mir, M., 1973

[2] J. Dieudonne, Elements d'analyse, tome IV. Chapitres XVIII à XX, Gauthier-Villars, Editeur, 1971 | MR | Zbl

[3] Yu. V. Titarenko, “O sistemakh uravnenii Pfaffa s neanaliticheskimi koeffitsientami”, UMN, 30:1 (1975), 265–266 | MR | Zbl

[4] E. Kartan, Vneshnie differentsialnye sistemy i ikh geometricheskie prilozheniya, MGU, 1962