@INPROCEEDINGS{Hanheide2012,
  author = {M. Hanheide and A. Peters and N. Bellotto},
  title = {Analysis of Human-Robot Spatial Behaviour applying a Qualitative Trajectory Calculus},
  booktitle = {Proc. of the IEEE Int. Symposium on Robot and Human Interactive Communication (Ro-Man)},
  year = {2012},
  pages = {689-694}
}