Geodesic
Surfaces with bounded extrinsic curvature and positive Gauss curvature
Doklady Akademii Nauk, Tome 200 (1971) no. 2, pp. 259-261 
Yu. F. Borisov; S. Z. Shefel'. Surfaces with bounded extrinsic curvature and positive Gauss curvature. Doklady Akademii Nauk, Tome 200 (1971) no. 2, pp. 259-261. http://geodesic.mathdoc.fr/item/DAN_1971_200_2_a1/
@article{DAN_1971_200_2_a1,
     author = {Yu. F. Borisov and S. Z. Shefel'},
     title = {Surfaces with bounded extrinsic curvature and positive {Gauss} curvature},
     journal = {Doklady Akademii Nauk},
     pages = {259--261},
     year = {1971},
     volume = {200},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_200_2_a1/}
}
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