%0 Journal Article %A L. G. Kurakin %T Critical cases of stability. Converse implicit function theorem for dynamical systems with cosymmetry %J Matematičeskie zametki %D 1998 %P 572-578 %V 63 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1998_63_4_a9/ %G ru %F MZM_1998_63_4_a9