@inproceedings{HeyeTimpf2019,
  author    = {Corinna Heye and Sabine Timpf},
  title     = {Factors influencing the physical complexity of routes in public transportation networks},
  booktitle = {10th International Conference on Travel Behavior Research, Luzern, Switzerland, 10-15 August 2003},
  url       = {http://archiv.ivt.ethz.ch/news/archive/20030810_IATBR/heye.pdf},
  year      = {2019},
}