@article{10_4153_CMB_1995_030_7,
     author = {Guo, Xiuzhan},
     title = {On the {Periodic} {Radical} of a {Ring}},
     journal = {Canadian mathematical bulletin},
     pages = {215--217},
     year = {1995},
     volume = {38},
     number = {2},
     doi = {10.4153/CMB-1995-030-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1995-030-7/}
}