@article{10_1017_S2040618500035310,
     author = {Peinado, R. E. and Leavitt, W. G.},
     title = {The maxit and minit of a ring},
     journal = {Glasgow mathematical journal},
     pages = {128--135},
     year = {1966},
     volume = {7},
     number = {3},
     doi = {10.1017/S2040618500035310},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500035310/}
}