%0 Journal Article %A A. A. Borisenko %T Extrinsically geometric, topological properties of parabolic and saddle surfaces in symmetric spaces of rank one %J Doklady Akademii Nauk %D 1981 %P 783-787 %V 257 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1981_257_4_a2/ %G ru %F DAN_1981_257_4_a2