@inproceedings { 09,
	booktitle = {International Conference on Multimodal Interfaces - ICMI 2009},
	keywords = {Affective Computing;Social Robotic Companions;},
	pages = {pp. 119--126 },
	publisher = {ACM},
	title = {Detecting user engagement with a robot companion using task and social interaction-based features},
	year = {2009},
	author = {Ginevra Castellano and André Pereira and Iolanda Leite and Ana Paiva and Peter Mc Owan}
}