@book{PPN591928396, title = {Die unbestimmte Analytik Abth. 1}, series = {GDML\_Books}, publisher = {Helwing}, address = {Hannover}, year = {1854}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN591928396} }
Scheffler, Hermann. Die unbestimmte Analytik Abth. 1. GDML_Books (1854), http://gdmltest.u-ga.fr/item/PPN591928396/