H. Cao, M. Xie, L. Xue, C. Liu, F. Teng, and Y. Huang. ECML PKDD Discovery Challenge 2009 (DC09), 497, page 35--48. Bled, Slovenia, CEUR Workshop Proceedings, (September 2009)
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, (2006)
H. Sack, and J. Waitelonis. Proceedings of the 1st Semantic Authoring and Annotation Workshop (SAAW'06), Athens (GA), USA, (November 2006)issn=1613-0073.