@article{JRAM_1929__160_149686,
     author = {Reinhold Baer},
     title = {Zur {Einf\"uhrung} des {Scharbegriffs.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {199--207},
     publisher = {mathdoc},
     volume = {160},
     year = {1929},
     zbl = {55.0084.03},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1929__160_149686/}
}