TY  - JOUR
AU  - Chang, Bai Ching
TI  - Which Abelian Groups Can be Fundamental Groups of Regions in Euclidean Spaces?
JO  - Canadian journal of mathematics
PY  - 1974
SP  - 7
EP  - 18
VL  - 26
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1974-002-4/
DO  - 10.4153/CJM-1974-002-4
ID  - 10_4153_CJM_1974_002_4
ER  -