S. Nilakanta, R. Wemhoff, and G. Prebhu. SIGBDP '90: Proceedings of the 1990 ACM SIGBDP conference on Trends
and directions in expert systems, page 58--71. New York, NY, USA, ACM Press, (1990)
C. Ritterskamp, and M. Prilla. Proceedings of COOP’06. Cooperative System Design. Seamless Integration
of Artifacts and Conversations - Enhaced Concepts of Infrastructure
for Communication - Workshop Supplement, (April 2006)
M. Markus, and T. Connolly. CSCW '90: Proceedings of the 1990 ACM conference on Computer-supported cooperative work, page 371--380. New York, NY, USA, ACM Press, (1990)