G. Little, L. Chilton, M. Goldman, and R. Miller. HCOMP '09: Proceedings of the ACM SIGKDD Workshop on Human Computation, page 29--30. New York, NY, USA, ACM, (2009)
X. Zhang, Y. Qu, C. Giles, and P. Song. CHI '08: Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, page 677--680. New York, NY, USA, ACM, (2008)
A. Hotho, R. Jäschke, C. Schmitz, and G. Stumme. Proceedings of the Conceptual Structure Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures, page 87-102. (2006)
E. Kemp, and D. Setungamudalige. CHINZ '06: Proceedings of the 7th ACM SIGCHI New Zealand chapter's international conference on Computer-human interaction, page 61--66. New York, NY, USA, ACM, (2006)