Geodesic
Contrast structure in the systems of singulary perturbed equations
Fundamentalʹnaâ i prikladnaâ matematika, Tome 3 (1997) no. 4, pp. 1117-1133.

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Systems of two second order singulary perturbed equations with the same small parameter are considered. For these systems the sufficient conditions of step type contrast structure existance are given and its asymptotic is found. At the end some numerical results are shown. 
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     author = {A. B. Vasil'eva and V. A. Anikeeva},
     title = {Contrast structure in the systems of singulary perturbed equations},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
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A. B. Vasil'eva; V. A. Anikeeva. Contrast structure in the systems of singulary perturbed equations. Fundamentalʹnaâ i prikladnaâ matematika, Tome 3 (1997) no. 4, pp. 1117-1133. http://geodesic.mathdoc.fr/item/FPM_1997_3_4_a15/