@inproceedings {PN4510,
	title = {Facial expressions as feedback cue in human-robot interaction - a comparison of human and automatic recognition performances},
	author = {Christian Lang AND Sven Wachsmuth AND Heiko Wersing AND Marc Hanheide},
	year = {2010},
	publisher = {San Francisco},
	booktitle = {CVPR Workshop for Human Communicative Behavior Analysis}
}