1. Ling, C., Gen-Cai, C., Chen-Guang, Y., Chuen, C.: Using Collaborative Knowledge Base to Realize Adaptive Message Filtering in Collaborative Virtual Environment. In: Proceedings of International Conference on Communication Technology, ICCT 2003, vol. 2, pp. 1655–1661. IEEE Press, Los Alamitos (2003)
2. Virtual World Review,
http://www.virtualworldsreview.com/info/whatis.shtml
3. Allen, I.E., Seaman, J.: Staying the course: Online education in the United States, The Sloan Consortium (2008)
4. Vassileva, J.: Toward Social Learning Environments. IEEE Transactions on Learning Technologies 1(4), 199–214 (2008)
5. Bule, J.: Adaptive E-learning Courses at Riga Technical University Software Engineering Department. In: Grundspenkis, J., Kirikova, M., Manolopoulos, Y., Morzy, T., Novickis, L., Vassen, G. (eds.) Local proceedings of the 13th East-European Conference Advances in Databases and Information Systems, ADBIS 2009, pp. 238–245. Riga Technical University, Riga, Latvia (2009)