1. Palfreyman, K.A., Rodden, T.: A protocol for user awareness on the World Wide Web. In: Procs. of CSCW 1996, pp. 130–139. ACM Press, New York (November 1996)
2. Fjuk, A., Dirckinck-Holmfeld, L.: Articulation of actions in distributed collaborative learning. Scandinavian Journal of Information Systems 9(2), 3–24 (1997)
3. Collazos, C., Guerrero, L., Pino, J., Ochoa, S.: Introducing Knowledge-Shared Awareness. In: Procs. of IASTED 2002, USA, pp. 13–18 (2002)
4. Preece, J.: Human-computer interaction. Addison-Wesley, Reading (1994)
5. Dillenbourg, P.: Some technical implications of the distributed cognition approach on the design of interactive learning environments. Journal of Artificial Intelligence in Education 7(2), 161–180 (1996)