@INPROCEEDINGS{Weinrich-IAS-2014,
  author = {Weinrich, {\relax Ch}ristoph and Wengefeld, Tim and Volkhardt, Michael
    and Scheidig, Andrea and Gross, Horst-Michael},
  title = {Generic Distance-Invariant Features for Detecting People with Walking
    Aid in {2D} Laser Range Data},
  booktitle = {Int. Conf. on Intelligent Autonomous Systems (IAS)},
  year = {2014}
}