@article{GDZPPN002260379, title = {On Quaternion Number-Systems}, journal = {Mathematische Annalen}, volume = {61}, year = {1905}, pages = {437-447}, zbl = {36.0282.02}, url = {http://dml.mathdoc.fr/item/GDZPPN002260379} }
Hawkes, H.E. On Quaternion Number-Systems. Mathematische Annalen, Tome 61 (1905) pp. 437-447. http://gdmltest.u-ga.fr/item/GDZPPN002260379/