@article {44,
	title = {Towards social robots: Automatic evaluation of human-robot interaction by face detection and expression classification},
	journal = {Advances in Neural Information Processing Systems},
	volume = {16},
	year = {2004},
	pages = {1563-1570},
	chapter = {1563},
	author = {Littlewort, G. and Bartlett, M. and Chenu, J. and Fasel, I. and Kanda, T. and Ishiguro, H. and Movellan, J.}
}