@article{GDZPPN002061619, title = {The Hurwitz Matrix Equations and Multifour Groups.}, journal = {Commentarii mathematici Helvetici}, volume = {50}, year = {1975}, pages = {45-58}, zbl = {0305.15006}, url = {http://dml.mathdoc.fr/item/GDZPPN002061619} }
Young, Samuel S.H. The Hurwitz Matrix Equations and Multifour Groups.. Commentarii mathematici Helvetici, Tome 50 (1975) pp. 45-58. http://gdmltest.u-ga.fr/item/GDZPPN002061619/