@article{CMH_1930__2_138544,
     author = {Anna Fischer},
     title = {Gruppen und {Verkettungen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {253--268},
     publisher = {mathdoc},
     volume = {2},
     year = {1930},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/CMH_1930__2_138544/}
}