TY  - JOUR
AU  - E. V. Shikin
TI  - The regular realization in the large in $E^3$ of two-dimensional metrics of class $C^2$ with negative curvature of class $C^1$
JO  - Doklady Akademii Nauk
PY  - 1969
SP  - 1014
EP  - 1016
VL  - 188
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1969_188_5_a13/
LA  - ru
ID  - DAN_1969_188_5_a13
ER  -