%0 Journal Article %A L. I. Karandjulov %A Y. P. Stoyanova %T Boundary Value Problem for Nonlinear Singularity perturbed Systems in Critical case of Exchange of Stability %J Μαθηματική Επιθεώρηση %D 1997 %P 91-116 %V 47 %I mathdoc %U http://geodesic.mathdoc.fr/item/MR_1997__47_a4/ %G gr %F MR_1997__47_a4