@article{MAN_1933__107_159606,
     author = {O. Perron},
     title = {Quadratische {Zahlk\"orper} mit {Euklidischem} {Algorithmus}},
     journal = {Mathematische Annalen},
     pages = {489--495},
     year = {1933},
     volume = {107},
     zbl = {0005.38703},
     url = {http://geodesic.mathdoc.fr/item/MAN_1933__107_159606/}
}