@article{10_4153_CJM_2007_027_x,
     author = {MacDonald, Gordon W.},
     title = {Distance from {Idempotents} to {Nilpotents}},
     journal = {Canadian journal of mathematics},
     pages = {638--657},
     year = {2007},
     volume = {59},
     number = {3},
     doi = {10.4153/CJM-2007-027-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2007-027-x/}
}