Antonio Silva Filho, Roberto Barros, and Hans Liesenberg. 2002.
 User Interface Design for Web Collaborative Systems. In <em>Proceedings of the 16th Brazilian Symposium on Software Engineering</em>, October 16, 2002, Gramado/RS, Brasil. SBC, Porto Alegre, Brasil, 331-346. DOI: <a href="https://doi.org/10.5753/sbes.2002.23956">https://doi.org/10.5753/sbes.2002.23956</a>.