@article{01894883, title = {Hopf mappings for complex quaternions.}, journal = {Beitr\"age zur Algebra und Geometrie}, volume = {44}, year = {2003}, pages = {245-262}, zbl = {1028.22014}, language = {en}, url = {http://dml.mathdoc.fr/item/01894883} }
Wallner, Johannes. Hopf mappings for complex quaternions.. Beiträge zur Algebra und Geometrie, Tome 44 (2003) pp. 245-262. http://gdmltest.u-ga.fr/item/01894883/