@INPROCEEDINGS{Coppola2015,
  author = {C. Coppola and O. M. Mozos and N. Bellotto},
  title = {Applying a 3D Qualitative Trajectory Calculus to Human Action Recognition
	using Depth Cameras},
  booktitle = {IEEE/RSJ IROS Workshop on Assistance and Service Robotics in a Human
	Environment},
  year = {2015}
}