@article{CMH_1937__10_138709,
     author = {H. Hadwiger and Paul Finsler},
     title = {Einige {Relationen} im {Dreieck.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {316--326},
     publisher = {mathdoc},
     volume = {10},
     year = {1937},
     zbl = {64.0631.07},
     url = {http://geodesic.mathdoc.fr/item/CMH_1937__10_138709/}
}