D. Millen, J. Feinberg, and B. Kerr. CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, page 111--120. New York, NY, USA, ACM Press, (2006)
H. Wu, M. Zubair, and K. Maly. HYPERTEXT '06: Proceedings of the seventeenth conference on Hypertext and hypermedia, page 111--114. New York, NY, USA, ACM Press, (2006)
A. Hotho, R. schke, C. Schmitz, and G. Stumme. Proceedings of the First Conceptual Structures Tool Interoperability Workshop at the 14 th International Conference on Conceptual Structures, page 87-102. Aalborg Universitetsforlag, (2006)
H. Halpin, V. Robu, and H. Shepherd. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 211--220. New York, NY, USA, ACM Press, (2007)