@incollection{KrispPetersBurkert2012,
  author    = {Jukka M. Krisp and Stefan Peters and Florian Burkert},
  title     = {Visualizing Crowd Movement Patterns Using a Directed Kernel Density Estimation},
  booktitle = {Earth Observation of Global Changes (EOGC)},
  editor    = {Jukka M. Krisp and Liqiu Meng and Roland Pail and Uwe Stilla},
  isbn      = {9783642327131},
  doi       = {10.1007/978-3-642-32714-8_17},
  year      = {2012},
}