@article{MZ_1929__30_168108,
     author = {R. Brauer},
     title = {\"Uber {Systeme} hyperkomplexer {Zahlen}},
     journal = {Mathematische Zeitschrift},
     pages = {79--107},
     year = {1929},
     volume = {30},
     zbl = {55.0088.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1929__30_168108/}
}