@article{CMH_1950__24_139009,
     author = {H. Bieri},
     title = {Die 1. {Variation} der {Ma{\ss}zahlen} eines {Elementarkegels.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {232--237},
     publisher = {mathdoc},
     volume = {24},
     year = {1950},
     zbl = {0040.09601},
     url = {http://geodesic.mathdoc.fr/item/CMH_1950__24_139009/}
}