@article{CMH_1936__9_138687,
     author = {Rud. Fueter},
     title = {Die {Singularit\"aten} der eindeutigen regul\"aren {Funktionen} einer {Quaternionenvariablen.} {I.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {320--334},
     publisher = {mathdoc},
     volume = {9},
     year = {1936},
     zbl = {0017.07601},
     url = {http://geodesic.mathdoc.fr/item/CMH_1936__9_138687/}
}