%0 Journal Article %A Sun Khe-shen %T On the rigidity of an unclosed surface of non-negative curvature in the case of a non-orthogonal bushing linkage %J Doklady Akademii Nauk %D 1958 %P 229-232 %V 121 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1958_121_2_a8/ %G ru %F DAN_1958_121_2_a8