@book{PPN615411975, title = {Integral-Rechnung Theil 2}, series = {GDML\_Books}, publisher = {Helwing}, address = {Hannover}, year = {1900}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN615411975} }
Kiepert, Ludwig. Integral-Rechnung Theil 2. GDML_Books (1900), http://gdmltest.u-ga.fr/item/PPN615411975/