Zur Geschichte der negativen Zahlen.
Arithmetik, Algebra, Analysis Bd. 1, GDML_Books, (1968), p. 27 / Harvested from
Access to full text 
@article{PPN376503645+dmdlog17,
     title = {Zur Geschichte der negativen Zahlen.},
     booktitle = {Arithmetik, Algebra, Analysis Bd. 1},
     series = {GDML\_Books},
     year = {1968},
     pages = {27},
     url = {http://dml.mathdoc.fr/item/PPN376503645+dmdlog17}
}

 (éd.). Zur Geschichte der negativen Zahlen., dans Arithmetik, Algebra, Analysis Bd. 1, GDML_Books,  (1968), p. 27. http://gdmltest.u-ga.fr/item/PPN376503645+dmdlog17/