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)
J. Vanhoenacker, A. Bryant, and G. Dedene. SIGCPR '99: Proceedings of the 1999 ACM SIGCPR conference on Computer
personnel research, page 231--241. New York, NY, USA, ACM Press, (1999)
S. Nilakanta, R. Wemhoff, and G. Prebhu. SIGBDP '90: Proceedings of the 1990 ACM SIGBDP conference on Trends
and directions in expert systems, page 58--71. New York, NY, USA, ACM Press, (1990)