@article{CMH_1949__22_138959,
     author = {Hans Bieri},
     title = {Ein geometrisches {Minimumproblem.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {103--114},
     publisher = {mathdoc},
     volume = {22},
     year = {1949},
     zbl = {0031.17604},
     url = {http://geodesic.mathdoc.fr/item/CMH_1949__22_138959/}
}