@article{MAN_1933__107_159616,
     author = {G. K\"othe},
     title = {Erweiterung des {Zentrums} einfacher {Algebren}},
     journal = {Mathematische Annalen},
     pages = {761--766},
     year = {1933},
     volume = {107},
     zbl = {0006.15301},
     url = {http://geodesic.mathdoc.fr/item/MAN_1933__107_159616/}
}