@article{PPN234736674+dmdlog227, title = {\S\ 189. Polygone}, booktitle = {Lehrbuch der Algebra Bd. 3}, series = {GDML\_Books}, year = {1908}, pages = {667}, url = {http://dml.mathdoc.fr/item/PPN234736674+dmdlog227} }
(éd.). § 189. Polygone, dans Lehrbuch der Algebra Bd. 3, GDML_Books, (1908), p. 667. http://gdmltest.u-ga.fr/item/PPN234736674+dmdlog227/