§. 203. Abzählbare Mengen
Lehrbuch der Algebra Bd. 2, GDML_Books, (1896), p. 745 / Harvested from
@article{PPN234735015+dmdlog239,
     title = {\S . 203. Abz\"ahlbare Mengen},
     booktitle = {Lehrbuch der Algebra Bd. 2},
     series = {GDML\_Books},
     year = {1896},
     pages = {745},
     url = {http://dml.mathdoc.fr/item/PPN234735015+dmdlog239}
}
 (éd.). §. 203. Abzählbare Mengen, dans Lehrbuch der Algebra Bd. 2, GDML_Books,  (1896), p. 745. http://gdmltest.u-ga.fr/item/PPN234735015+dmdlog239/