Geodesic
Conditions for existence of relaxation oscillations in singular systems of low dimension
Sibirskij žurnal industrialʹnoj matematiki, Tome 8 (2005) no. 3, pp. 87-92 
L. I. Kononenko. Conditions for existence of relaxation oscillations in singular systems of low dimension. Sibirskij žurnal industrialʹnoj matematiki, Tome 8 (2005) no. 3, pp. 87-92. http://geodesic.mathdoc.fr/item/SJIM_2005_8_3_a9/
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     title = {Conditions for existence of relaxation oscillations in singular systems of low dimension},
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Voir la notice de l'article provenant de la source Math-Net.Ru

Relaxation oscillations are studied in a singularly perturbed system of ordinary differential equations with $m$ slow and $n$ fast variables for the case of $m=2$ and $n=1$. Necessary conditions and sufficient conditions for existence of relaxation oscillations are given.

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