Bessam Abdulrazak, Sylvain Giroux, Bruno Bouchard, Hélène Pigot, Mounir Mokhtari: Toward Useful Services for Elderly and People with Disabilities - 9th International Conference on Smart Homes and Health Telematics, ICOST 2011, Montreal, Canada, June 20-22, 2011. Proceedings. Lecture Notes in Computer Science 6719, Springer 2011, ISBN 978-3-642-21534-6