%0 Journal Article %A I. A. Danelich %T The unequivocal definiteness of certain convex surfaces in the Lobachesvky space %J Doklady Akademii Nauk %D 1957 %P 217-219 %V 115 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1957_115_2_a3/ %G ru %F DAN_1957_115_2_a3