@article{UBHD-68224609,
  author={Hahmann, Stefan and Miksch, Jakob and Resch, Bernd and Lauer, Johannes and Zipf, Alexander},
  title={Routing through open spaces},
  subtitle={a performance comparison of algorithms},
  year={2018},
  pages={247-256},
  language={eng},
  issn={1993-5153},
  volume={21},
  number={3},
  note={Gesehen am 14.01.2019},
  journal={Geo-spatial information science},
  doi={10.1080/10095020.2017.1399675},
}
@article{UBHD-68094649,
  author={John, Steffen and Hahmann, Stefan and Rousell, Adam and Zipf, Alexander},
  title={Deriving incline values for street networks from voluntarily collected GPS traces},
  year={2016},
  pages={152-169},
  language={eng},
  issn={1545-0465},
  volume={44},
  number={2},
  journal={Cartography and geographic information science},
  doi={10.1080/15230406.2016.1190300},
}