V. Devedzic, J. Good, A. Harrer, R. Luckin, D. Pearce, S. Retalis, and J. Robertson. Artificial Intelligence in Education - Building Technology Rich Learning Contexts that Work, volume 158 of Frontiers in Artificial Intelligence and Applications, page 715. Amsterdam, IOS Press, (2007)
T. Schummer, S. Lukosch, and R. Slagter. Groupware: Design, Implementation, and Use, 11th International Workshop, CRIWG 2005, Lecture Notes in Computer Sciecne 3706, page 73-88. Berlin Heidelberg, Springer-Verlag, (2005)