@article{MAN_1923__88_158986,
     author = {H. Brandt},
     title = {\"Uber ein {Problem} von {A.} {Hurwitz,} quatern\"are, quadratische {Formen} betreffend},
     journal = {Mathematische Annalen},
     pages = {211--214},
     publisher = {mathdoc},
     volume = {88},
     year = {1923},
     zbl = {49.0073.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1923__88_158986/}
}