TY  - JOUR
AU  - Yu. V. Kuz'min
TI  - The groups of knotted compact surfaces, and central extensions
JO  - Sbornik. Mathematics
PY  - 1996
SP  - 237
EP  - 257
VL  - 187
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1996_187_2_a4/
LA  - en
ID  - SM_1996_187_2_a4
ER  -