Geodesic
Solution to Singularly Perturbed Boundary Value Problems by the Duck Hunting Method
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Algebra. Topology. Differential equations and their applications, Tome 224 (1999), pp. 187-207.

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A situation is analyzed when two different curves of slow motion intersect in a general way in a two-dimensional relaxation system. It is shown that this situation gives rise to the so-called duck trajectories. The results of the analysis are applied to the construction of the asymptotics of the principal eigenvalue of the Dirichlet problem for a singularly perturbed Schrödinger equation. 
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A. Yu. Kolesov; E. F. Mishchenko; N. Kh. Rozov. Solution to Singularly Perturbed Boundary Value Problems by the Duck Hunting Method. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Algebra. Topology. Differential equations and their applications, Tome 224 (1999), pp. 187-207. http://geodesic.mathdoc.fr/item/TM_1999_224_a11/

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