Geodesic
Riemannian spaces having their curvature bounded below by a positive number
Doklady Akademii Nauk, Tome 120 (1958) no. 4, pp. 719-721 
V. A. Toponogov. Riemannian spaces having their curvature bounded below by a positive number. Doklady Akademii Nauk, Tome 120 (1958) no. 4, pp. 719-721. http://geodesic.mathdoc.fr/item/DAN_1958_120_4_a8/
@article{DAN_1958_120_4_a8,
     author = {V. A. Toponogov},
     title = {Riemannian spaces having their curvature bounded below by a positive number},
     journal = {Doklady Akademii Nauk},
     pages = {719--721},
     year = {1958},
     volume = {120},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_120_4_a8/}
}
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