@article{10_4153_CJM_1968_003_8,
     author = {Carlson, R. E. and Cullen, C. G.},
     title = {Commutativity for {Matrices} of {Quaternions}},
     journal = {Canadian journal of mathematics},
     pages = {21--24},
     year = {1968},
     volume = {20},
     number = {1},
     doi = {10.4153/CJM-1968-003-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-003-8/}
}