@article{10_4153_CJM_1970_092_1,
     author = {Dlab, Vlastimil},
     title = {On a {Class} of {Perfect} {Rings}},
     journal = {Canadian journal of mathematics},
     pages = {822--826},
     year = {1970},
     volume = {22},
     number = {4},
     doi = {10.4153/CJM-1970-092-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-092-1/}
}