TY  - JOUR
AU  - O. Ya. Viro
TI  - Branched coverings of manifolds with boundary and link invariants.~I
JO  - Izvestiya. Mathematics 
PY  - 1973
SP  - 1239
EP  - 1256
VL  - 7
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1973_7_6_a2/
LA  - en
ID  - IM2_1973_7_6_a2
ER  -