@article{10_4153_CMB_1992_025_0,
     author = {Du, Xiankun},
     title = {The {Centers} of a {Radical} {Ring}},
     journal = {Canadian mathematical bulletin},
     pages = {174--179},
     year = {1992},
     volume = {35},
     number = {2},
     doi = {10.4153/CMB-1992-025-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1992-025-0/}
}