@article{PPN622645943+DMDLOG_0003, title = {Planimetrie.}, booktitle = {Leitfaden der Elementar-Mathematik Teil 1}, series = {GDML\_Books}, publisher = {Schmidt}, address = {Helmstedt}, year = {1882}, pages = {43}, url = {http://dml.mathdoc.fr/item/PPN622645943+DMDLOG_0003} }
(éd.). Planimetrie., dans Leitfaden der Elementar-Mathematik Teil 1, GDML_Books, (1882), p. 43. http://gdmltest.u-ga.fr/item/PPN622645943+DMDLOG_0003/