Geodesic
On the rigidity of an unclosed surface of non-negative curvature in the case of a non-orthogonal bushing linkage
Doklady Akademii Nauk, Tome 121 (1958) no. 2, pp. 229-232 
Sun Khe-shen. On the rigidity of an unclosed surface of non-negative curvature in the case of a non-orthogonal bushing linkage. Doklady Akademii Nauk, Tome 121 (1958) no. 2, pp. 229-232. http://geodesic.mathdoc.fr/item/DAN_1958_121_2_a8/
@article{DAN_1958_121_2_a8,
     author = {Sun Khe-shen},
     title = {On the rigidity of an unclosed surface of non-negative curvature in the case of a non-orthogonal bushing linkage},
     journal = {Doklady Akademii Nauk},
     pages = {229--232},
     year = {1958},
     volume = {121},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_121_2_a8/}
}
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