J. Taylor, D. Poliakov, and L. Mazlack. Fuzzy Information Processing Society, 2005. NAFIPS 2005. Annual Meeting of the North American, page 418- 423. (2005)
N. Tun. AOW '06: Proceedings of the second Australasian workshop on Advances in ontologies, page 91--100. Darlinghurst, Australia, Australia, Australian Computer Society, Inc., (2006)
O. Udrea, L. Getoor, and R. Miller. SIGMOD '07: Proceedings of the 2007 ACM SIGMOD international conference on Management of data, page 449--460. New York, NY, USA, ACM, (2007)
L. von Ahn, M. Kedia, and M. Blum. CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, page 75--78. New York, NY, USA, ACM Press, (2006)
L. von Ahn, and L. Dabbish. CHI '04: Proceedings of the SIGCHI conference on Human factors in computing systems, page 319--326. New York, NY, USA, ACM Press, (2004)
X. Wang, M. Hauswirth, T. Vitvar, and M. Zaremba. SAC '08: Proceedings of the 2008 ACM symposium on Applied computing, page 2237--2242. New York, NY, USA, ACM, (2008)
S. Wedig, and O. Madani. KDD '06: Proceedings of the 12th ACM SIGKDD international conference on Knowledge discovery and data mining, page 742--747. New York, NY, USA, ACM, (2006)