@book{PPN584719388, title = {Die Operationen an einfachen rationalen Zahlen 1. Abth.}, series = {GDML\_Books}, publisher = {Hahn}, year = {1846}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN584719388} }
Wittstein, Theodor. Die Operationen an einfachen rationalen Zahlen 1. Abth.. GDML_Books (1846), http://gdmltest.u-ga.fr/item/PPN584719388/