@article{10_4153_CMB_1998_013_2,
     author = {Lanski, Charles},
     title = {The {Cardinality} of the {Center} of a {PI} {Ring}},
     journal = {Canadian mathematical bulletin},
     pages = {81--85},
     year = {1998},
     volume = {41},
     number = {1},
     doi = {10.4153/CMB-1998-013-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1998-013-2/}
}