S. Bateman, C. Brooks, and G. Mccalla. in Proc. Workshop on Applications of Semantic Web Technologies for e-Learning, at the 4th International Conference on Adaptive Hypermedia and Adaptive Web-based Systems, page 3--12. (2006)
K. Lee, H. Kim, C. Jang, and H. Kim. WWW '08: Proceeding of the 17th international conference on World Wide Web, page 1093--1094. New York, NY, USA, ACM, (2008)
M. Tsagias, M. Larson, and M. de Rijke. SIGIR '08: Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, page 773--774. New York, NY, USA, ACM, (2008)