1. Urnes, T., Nejabi, R.: Tools for implementing groupware: Survey and evaluation. Technical Report No. CS-94-03, York University (1994)
2. Lecture Notes in Computer Science;S. Lukosch,2002
3. Patterson, J.: Taxonomy of Architectures for Synchronous Groupware Architectures. ACM SIGOIS Bulletin 15(3), 27–29 (1995)
4. Dewan, P.: Multiuser Architectures. In: Proc. 10th ACM Symposium on Operating Systems Principles, Orcas Island, Washington, USA, pp. 63–78 (1985)
5. Roth, J., Unger, C.: An extensible classification model for distribution architectures of synchronous groupware. In: Proc. 4th International Conference on Design of Cooperative Systems (COOP2000), Sophia, Antipolis, France (2000)