@article{10_4153_CMB_1994_064_x,
     author = {Bell, Howard E. and Daif, Mohamad Nagy},
     title = {On {Commutativity} and {Strong} {Commutativity-Preserving} {Maps}},
     journal = {Canadian mathematical bulletin},
     pages = {443--447},
     year = {1994},
     volume = {37},
     number = {4},
     doi = {10.4153/CMB-1994-064-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1994-064-x/}
}