Geodesic
Contrast structures in singularly perturbed problems
Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 3, pp. 799-851.

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Some new results in singular perturbation theory — namely the basic positions of contrast structures theory — are presented. The algorithm of asymptotic expansion, the existence and stability theorems for different contrast structures in ordinary nonlinear differential equations and also in partial differential equations are formulated. The new asymptotic differential inequalities method for proving of these theorems is proposed. 
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     author = {A. B. Vasil'eva and V. F. Butuzov and N. N. Nefedov},
     title = {Contrast structures in singularly perturbed problems},
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A. B. Vasil'eva; V. F. Butuzov; N. N. Nefedov. Contrast structures in singularly perturbed problems. Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 3, pp. 799-851. http://geodesic.mathdoc.fr/item/FPM_1998_4_3_a0/