§. 149. Congruenzen
Lehrbuch der Algebra Bd. 2, GDML_Books, (1896), p. 541 / Harvested from
Access to full text 
@article{PPN234735015+dmdlog177,
     title = {\S . 149. Congruenzen},
     booktitle = {Lehrbuch der Algebra Bd. 2},
     series = {GDML\_Books},
     year = {1896},
     pages = {541},
     url = {http://dml.mathdoc.fr/item/PPN234735015+dmdlog177}
}

 (éd.). §. 149. Congruenzen, dans Lehrbuch der Algebra Bd. 2, GDML_Books,  (1896), p. 541. http://gdmltest.u-ga.fr/item/PPN234735015+dmdlog177/