@article{PPN234735015+dmdlog81, title = {\S . 63. Functionen-Congruenzen}, booktitle = {Lehrbuch der Algebra Bd. 2}, series = {GDML\_Books}, year = {1896}, pages = {242}, url = {http://dml.mathdoc.fr/item/PPN234735015+dmdlog81} }
(éd.). §. 63. Functionen-Congruenzen, dans Lehrbuch der Algebra Bd. 2, GDML_Books, (1896), p. 242. http://gdmltest.u-ga.fr/item/PPN234735015+dmdlog81/