D. Pizzi, M. Cavazza, und J. Lugrin. Proceedings of the 6th international joint conference on Autonomous agents and multiagent systems, Seite 12:1--12:3. New York, NY, USA, ACM, (2007)
P. Seitlinger, und T. Ley. Proceedings of the 2012 ACM annual conference on Human Factors in Computing Systems, Seite 1631--1640. New York, NY, USA, ACM, (2012)