1. Bouras, C., Tsiatsos, T.: pLVE: Suitable Network Protocol Supporting Multi-User Virtual Environments in Education. In: International Conference on Information and Communication Technologies for Education, Vienna, Austria, pp. 73–81 (2000)
2. Elliott, C., Lester, J.C., Rickel, J.: Integrating affective computing into animated tutoring agents. In: Proceedings of IJCAI 1997 workshop on Intelligent Interface Agents (1997)
3. Fellner, D.W., Hopp, A.: VR-LAB - A Distributed Multi-User Environment for Educational Purposes and Presentations. In: Proceedings of the Fourth Symposium on the Virtual Reality Modeling Language, Germany, pp. 121–132 (1999)
4. Funkhouser, T.: Network Topologies for Scalable Multi-User Virtual Environments. In: Proceedings of IEEE VRAIS 1996, pp. 222–228 (1996)
5. Greenhalgh, C.: Implementing Multi-user Virtual Worlds: Ideologies and Issues. In: Proceedings of the Web3D-VRML 2000 fifth Symposium on Virtual Reality Modeling Language, pp. 149–154 (2000)