TY  - JOUR
AU  - Z. D. Usmanov
TI  - On Efimov surfaces that are rigid 'in the~small'
JO  - Sbornik. Mathematics
PY  - 1996
SP  - 903
EP  - 915
VL  - 187
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1996_187_6_a7/
LA  - en
ID  - SM_1996_187_6_a7
ER  -