@article{10_4153_CMB_1960_021_7,
     author = {Thierrin, G.},
     title = {On {Duo} {Rings}},
     journal = {Canadian mathematical bulletin},
     pages = {167--172},
     year = {1960},
     volume = {3},
     number = {2},
     doi = {10.4153/CMB-1960-021-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1960-021-7/}
}