@inbook{400467, title = {Zweiter Theil. Elementarlehre. \S 46}, booktitle = {Wissenschaftlehre}, series = {GDML\_Books}, publisher = {J.E. v Seidel}, address = {Sulzbach}, year = {1837}, pages = {213-214}, url = {http://dml.mathdoc.fr/item/400467} }
(éd.). Zweiter Theil. Elementarlehre. §46, dans Wissenschaftlehre, GDML_Books, (1837), pp. 213-214. http://gdmltest.u-ga.fr/item/400467/