@article{MZ_1935__39_168542,
     author = {O. Bottema},
     title = {\"Uber die {Irrfahrt} in einem {Strassennetz}},
     journal = {Mathematische Zeitschrift},
     pages = {137--145},
     publisher = {mathdoc},
     volume = {39},
     year = {1935},
     zbl = {0009.26403},
     url = {http://geodesic.mathdoc.fr/item/MZ_1935__39_168542/}
}