Geodesic
Contrast structures with steps in systems of singularly perturbed equations
Fundamentalʹnaâ i prikladnaâ matematika, Tome 5 (1999) no. 3, pp. 791-800.

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A definite system of two second order singularly perturbed equations with the same small parameter is considered. The requirements providing the existence of a contrast structure with steps in both components are formulated and its asymptotic behavior is designed. At the end we give the numerical solution of more general form singular system, which demonstrates the existence of the indicated type contrast structure. 
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     author = {A. B. Vasil'eva and V. A. Anikeeva},
     title = {Contrast structures with steps in systems of singularly perturbed equations},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
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A. B. Vasil'eva; V. A. Anikeeva. Contrast structures with steps in systems of singularly perturbed equations. Fundamentalʹnaâ i prikladnaâ matematika, Tome 5 (1999) no. 3, pp. 791-800. http://geodesic.mathdoc.fr/item/FPM_1999_5_3_a9/