%0 Journal Article %A Karandzhulov, Lyudmil %A Sirakova, Neli %T Asymptotic Expansion of Solution for Almost Regular and Weakly Perturbed Systems of Ordinary Differential Equations %J Mathematics and Education in Mathematics %D 2012 %P 185-190 %V 41 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MEM_2012_41_1_a17/ %G en %F MEM_2012_41_1_a17