@inproceedings { leite09, booktitle = {Workshop on Affective Interaction in Natural Environments - AFFINE 2009}, keywords = {Affective Computing;Social Robotic Companions;}, publisher = {ACM Proceedings}, title = {Designing a Game Companion for Long-Term Social Interaction}, year = {2009}, author = {Iolanda Leite and Ginevra Castellano and André Pereira and Carlos Martinho and Ana Paiva and Peter Mc Owan} }