TY  - JOUR
AU  - È. R. Rozendorn
TI  - The exactness of theorems on the smoothness of a surface with negative curvature of given smoothness
JO  - Vestnik Moskovskogo universiteta. Matematika, mehanika
PY  - 1994
SP  - 99
EP  - 101
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VMUMM_1994_2_a13/
LA  - ru
ID  - VMUMM_1994_2_a13
ER  -