Marc Spaniol Qing Li Ralf Klamma Rynson W. H. Lau Advances in Web Based Learning - ICWL 2009, 8th International Conference, Aachen, Germany, August 19-21, 2009. Proceedings 5686 2009 978-3-642-03425-1 http://dx.doi.org/10.1007/978-3-642-03426-8 Lecture Notes in Computer Science Springer ICWL db/conf/icwl/icwl2009.html