@article{MZ_1952__56_169266,
     author = {Reinhold Baer},
     title = {Kriterien f\"ur die {Existenz} eines {Einselements} in {Ringen.}},
     journal = {Mathematische Zeitschrift},
     pages = {1--17},
     publisher = {mathdoc},
     volume = {56},
     year = {1952},
     zbl = {0047.26501},
     url = {http://geodesic.mathdoc.fr/item/MZ_1952__56_169266/}
}