@INPROCEEDINGS{Ruttkay13128:2008,
 	author={Z.M. Ruttkay and H. van Welbergen},
 	title={Elbows higher! Performing, observing and correcting exercises by a Virtual Trainer},
 	booktitle={Proceedings of the Eight International Conference on Intelligent Virtual Agents},
 	year=2008,
 	volume=5208,
 	series={Lecture Notes in Artificial Intelligence},
 	pages={409--416},
 	address={London},
 	publisher={Springer Verlag}, 
}