@INPROCEEDINGS{schall08,
  author={Schall, G. and Grabner, H. and Grabner, M. and Wohlhart, P. and Schmalstieg, D. and Bischof, H.},
  booktitle={Proc. IEEE Computer Vision and Pattern Recognition Workshops (CVPRW)},
  title={{3D} tracking in unknown environments using on-line keypoint learning for mobile augmented reality},
  year={2008},
  month=june
}