Geodesic
The regular realization in the large in $E^3$ of two-dimensional metrics of class $C^2$ with negative curvature of class $C^1$
Doklady Akademii Nauk, Tome 188 (1969) no. 5, pp. 1014-1016.

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@article{DAN_1969_188_5_a13,
     author = {E. V. Shikin},
     title = {The regular realization in the large in $E^3$ of two-dimensional metrics of class $C^2$ with negative curvature of class $C^1$},
     journal = {Doklady Akademii Nauk},
     pages = {1014--1016},
     publisher = {mathdoc},
     volume = {188},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_188_5_a13/}
}
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E. V. Shikin. The regular realization in the large in $E^3$ of two-dimensional metrics of class $C^2$ with negative curvature of class $C^1$. Doklady Akademii Nauk, Tome 188 (1969) no. 5, pp. 1014-1016. http://geodesic.mathdoc.fr/item/DAN_1969_188_5_a13/