TY  - JOUR
AU  - È. R. Rozendorn
TI  - Some sufficient conditions for regularity of a surface with constant negative intrinsic curvature
JO  - Doklady Akademii Nauk
PY  - 1972
SP  - 296
EP  - 299
VL  - 207
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1972_207_2_a11/
LA  - ru
ID  - DAN_1972_207_2_a11
ER  -