@article{10_4153_CJM_1974_002_4,
     author = {Chang, Bai Ching},
     title = {Which {Abelian} {Groups} {Can} be {Fundamental} {Groups} of {Regions} in {Euclidean} {Spaces?}},
     journal = {Canadian journal of mathematics},
     pages = {7--18},
     year = {1974},
     volume = {26},
     number = {1},
     doi = {10.4153/CJM-1974-002-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1974-002-4/}
}