Parnes, Peter; Synnes, Kåre; Schefström, Dick (1997): The CDT MStar Environment: Scalable Distributed Teamwork in Action. Proceedings of the 1997 ACM International Conference on Supporting Group Work. DOI: 10.1145/266838.266894. New York, NY, USA: Association for Computing Machinery. pp. 167–176. Phoenix, Arizona, USA