@article{AM2_1973__9_136325,
     author = {W. KEITH NICHOLSON},
     title = {Rings whose {Elements} are {Quasi-Regular} or {Regular}},
     journal = {Aequationes mathematicae},
     pages = {64--70},
     publisher = {mathdoc},
     volume = {9},
     year = {1973},
     zbl = {0255.16006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1973__9_136325/}
}