@article{MZ_1919__5_167543,
     author = {B., Weitzenb\"ock},
     title = {\"Uber eine {Ungleichung} in der {Dreiecksgeometrie}},
     journal = {Mathematische Zeitschrift},
     pages = {137--146},
     publisher = {mathdoc},
     volume = {5},
     year = {1919},
     zbl = {47.0562.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1919__5_167543/}
}