@INPROCEEDINGS{Weinrich-IROS-2012,
  author = {Weinrich, {\relax Ch}ristoph and Vollmer, {\relax Ch}ristian and
    Gross, Horst-Michael},
  title = {Estimation of Human Upper Body Orientation for Mobile Robotics using
    an SVM Decision Tree on Monocular Images},
  booktitle = {IEEE/RSJ Int. Conf. on Intelligent Robots and Systems (IROS)},
  year = {2012},
  pages = {2147--2152},
  publisher = {IEEE}
}