TY  - JOUR
AU  - I. S. Brandt
TI  - Some properties of surfaces with slowly varying negative extrinsic curvature in a~Riemannian space
JO  - Sbornik. Mathematics
PY  - 1970
SP  - 313
EP  - 324
VL  - 12
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1970_12_2_a9/
LA  - en
ID  - SM_1970_12_2_a9
ER  -