@article{JDM_1927__36_145748,
     author = {H. Wieleitner},
     title = {Zur {Fr\"uhgeschichte} des {Imagin\"aren.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {74--87},
     publisher = {mathdoc},
     volume = {36},
     year = {1927},
     zbl = {53.0012.01},
     url = {http://geodesic.mathdoc.fr/item/JDM_1927__36_145748/}
}