%0 Journal Article %A A. V. Babin %A M. I. Vishik %T Unstable invariant sets of semigroups of non-linear operators and their perturbations %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1986 %P 1-41 %V 41 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1986_41_4_a0/ %G en %F RM_1986_41_4_a0