@article{CMH_1947__20_138912,
     author = {F. B\"abler},
     title = {\"Uber einen {Satz} aus der {Theorie} der {Kristallklassen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {65--67},
     publisher = {mathdoc},
     volume = {20},
     year = {1947},
     zbl = {0034.15802},
     url = {http://geodesic.mathdoc.fr/item/CMH_1947__20_138912/}
}