1. Information Technologies for Science and Higher Education. Program for the period of 2001 2006. Lithuanian Ministry for Education and Science (2001) (retrieved on April 4, 2006), http://www.itmis.lt
2. Aoki, K., Pogroszewski, D.: Virtual University Reference Model: A Guide to Delivering Education and Support Services to the Distance Learner. In Online Journal of Distance Learning Administration. vol. 1(3). State University of West Georgia, Distance Education Center (1998) (retrieved on April 12, 2006), http://pebbles.westga.edu/~distance/aoki13.html
3. Whittaker, S., O’Conaill, B.: The role of vision in face-to-face and mediated communication. In: Finn, K., Sellen, A., Wilbur, S. (eds.) Video-mediated communication, pp. 23–49. Lawrence Erlbaum Associates, Inc., Mahwah (1997)
4. Carvalho, C.: Modernizing and Globalizing the Learning Environment: Video-Conferencing in Education. In: Distance Education in Small States, 2000 Conference Proceedings, The University of the West Indies/The Commonwealth of Learning, pp. 299–309 (2000)
5. Lecture Notes in Computer Science;C. Süß,1999