@article{10_4153_CMB_1978_070_x,
     author = {Bell, Howard E.},
     title = {On the {Power} {Map} and {Ring} {Commutativity}},
     journal = {Canadian mathematical bulletin},
     pages = {399--404},
     year = {1978},
     volume = {21},
     number = {4},
     doi = {10.4153/CMB-1978-070-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1978-070-x/}
}