@book{PPN593233409, title = {Grundgesetze der Arithmetik Bd. 1}, series = {GDML\_Books}, publisher = {Pohle}, address = {Jena}, year = {1893}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN593233409} }
Frege, Friedrich Ludwig Gottlob. Grundgesetze der Arithmetik Bd. 1. GDML_Books (1893), http://gdmltest.u-ga.fr/item/PPN593233409/