@article{10_4153_CJM_1975_058_7,
     author = {Lawrence, John},
     title = {The {Coefficient} {Ring} of a {Primitive} {Group} {Ring}},
     journal = {Canadian journal of mathematics},
     pages = {489--494},
     year = {1975},
     volume = {27},
     number = {3},
     doi = {10.4153/CJM-1975-058-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-058-7/}
}