TY  - JOUR
AU  - Burde, Gerhard
TI  - On Branched Coverings of S3
JO  - Canadian journal of mathematics
PY  - 1971
SP  - 84
EP  - 89
VL  - 23
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-009-2/
DO  - 10.4153/CJM-1971-009-2
ID  - 10_4153_CJM_1971_009_2
ER  -