Geodesic
Legendre Singularities in Systems of Implicit ODEs and Slow--Fast Dynamical Systems
Informatics and Automation, Differential equations and dynamical systems, Tome 261 (2008), pp. 140-153.

Voir la notice de l'article provenant de la source Math-Net.Ru

Generic properties of regular first integrals of systems of implicit differential equations are considered. In particular, for systems of two equations with two phase variables, a classification of generic bifurcations of integral level surfaces is described. 
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V. M. Zakalyukin; A. O. Remizov. Legendre Singularities in Systems of Implicit ODEs and Slow--Fast Dynamical Systems. Informatics and Automation, Differential equations and dynamical systems, Tome 261 (2008), pp. 140-153. http://geodesic.mathdoc.fr/item/TRSPY_2008_261_a10/

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