%0 Journal Article %A E. M. Bronshtein %T Topological properties of extremal boundaries of convex compact sets in $I^2$ %J Funkcionalʹnyj analiz i ego priloženiâ %D 1985 %P 60-61 %V 19 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1985_19_1_a7/ %G ru %F FAA_1985_19_1_a7