%0 Journal Article %A V. I. Arnol'd %T Bifurcations of invariant manifolds of differential equations and normal forms in neighborhoods of elliptic curves %J Funkcionalʹnyj analiz i ego priloženiâ %D 1976 %P 1-12 %V 10 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1976_10_4_a0/ %G ru %F FAA_1976_10_4_a0