Geodesic
The Pontryagin delay phenomenon and stable ducktrajectories for multidimensional relaxation systems with one slow variable
Sbornik. Mathematics, Tome 70 (1991) no. 1, pp. 1-10

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It is assumed that the equilibrium state of the relaxation system $$ \varepsilon\dot x=f(x,y), \qquad \dot y=g(x,y,\mu), $$ where $x\in R^n$ and $y\in R$, passes generically through a point of discontinuity as $\mu$ varies. Under this condition stable duck cycles and cycles arising in a neighborhood of the equilibrium state are constructed. 
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     author = {A. Yu. Kolesov and E. F. Mishchenko},
     title = {The {Pontryagin} delay phenomenon and stable ducktrajectories for multidimensional relaxation systems with one slow variable},
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A. Yu. Kolesov; E. F. Mishchenko. The Pontryagin delay phenomenon and stable ducktrajectories for multidimensional relaxation systems with one slow variable. Sbornik. Mathematics, Tome 70 (1991) no. 1, pp. 1-10. http://geodesic.mathdoc.fr/item/SM_1991_70_1_a0/