TY  - JOUR
AU  - N. V. Efimov
TI  - Impossibility of an isometric imbedding in Euclidean 3-space of certain manifolds with negative Gaussian curvature
JO  - Doklady Akademii Nauk
PY  - 1962
SP  - 296
EP  - 299
VL  - 146
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1962_146_2_a9/
LA  - ru
ID  - DAN_1962_146_2_a9
ER  -