Geodesic
Isometric imbeddings of class $C^1$
Doklady Akademii Nauk, Tome 195 (1970) no. 5, pp. 1052-1054 
S. Z. Shefel'. Isometric imbeddings of class $C^1$. Doklady Akademii Nauk, Tome 195 (1970) no. 5, pp. 1052-1054. http://geodesic.mathdoc.fr/item/DAN_1970_195_5_a13/
@article{DAN_1970_195_5_a13,
     author = {S. Z. Shefel'},
     title = {Isometric imbeddings of class $C^1$},
     journal = {Doklady Akademii Nauk},
     pages = {1052--1054},
     year = {1970},
     volume = {195},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_195_5_a13/}
}
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