%0 Journal Article %A V. F. Safonov %T The regularization method for singularly perturbed systems of nonlinear differential equations %J Izvestiya. Mathematics %D 1980 %P 571-596 %V 14 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1980_14_3_a3/ %G en %F IM2_1980_14_3_a3