S. Benford, и O. Lee. IFIP International Working Conference on Upper Layer Protocols, Architectures & Applications, стр. 347-360. Barcelona, Spain, (1994)
S. Benford, и L. Fahlén. ECSCW'93: Proceedings of the third conference on European Conference on Computer-Supported Cooperative Work, стр. 109--124. Kluwer Academic Publishers, (1993)