@article{PPN615467385+DMDLOG_0006, title = {Differential Rechnung. Erster Theil.}, booktitle = {Differential-Rechnung Theil 1}, series = {GDML\_Books}, publisher = {Helwing}, address = {Hannover}, year = {1888}, pages = {46}, url = {http://dml.mathdoc.fr/item/PPN615467385+DMDLOG_0006} }
(éd.). Differential Rechnung. Erster Theil., dans Differential-Rechnung Theil 1, GDML_Books, (1888), p. 46. http://gdmltest.u-ga.fr/item/PPN615467385+DMDLOG_0006/