Geodesic
On immediate-delayed exchange of stabilities and periodic forced canards
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 48 (2008) no. 1, pp. 46-61

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Singularly perturbed nonautonomous ordinary differential equations are studied for which the associated equations have equilibrium states consisting of at least two intersecting curves, which leads to exchange of stabilities of these equilibria. The asymptotic method of differential equations is used to derive conditions under which initial value problems have solutions characterized by immediate and delayed exchange of stabilities. These results are then used to prove the existence of periodic canard solutions. 
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N. N. Nefedov; K. R. Schneider. On immediate-delayed exchange of stabilities and periodic forced canards. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 48 (2008) no. 1, pp. 46-61. http://geodesic.mathdoc.fr/item/ZVMMF_2008_48_1_a3/