@article{10_4153_CJM_1982_002_8,
     author = {Krempa, Jan},
     title = {Isomorphic {Group} {Rings} of {Free} {Abelian} {Groups}},
     journal = {Canadian journal of mathematics},
     pages = {8--16},
     year = {1982},
     volume = {34},
     number = {1},
     doi = {10.4153/CJM-1982-002-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1982-002-8/}
}