%0 Journal Article %A A. B. Vasil'eva %A V. A. Anikeeva %T Contrast structures with steps in systems of singularly perturbed equations %J Fundamentalʹnaâ i prikladnaâ matematika %D 1999 %P 791-800 %V 5 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/FPM_1999_5_3_a9/ %G ru %F FPM_1999_5_3_a9