TY  - JOUR
AU  - Hempel, John
TI  - Homology of Branched Coverings of 3-Manifolds
JO  - Canadian journal of mathematics
PY  - 1991
SP  - 119
EP  - 134
VL  - 44
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1992-007-4/
DO  - 10.4153/CJM-1992-007-4
ID  - 10_4153_CJM_1992_007_4
ER  -