H. Wu, M. Zubair, и K. Maly. HYPERTEXT '06: Proceedings of the seventeenth conference on Hypertext
and hypermedia, стр. 111--114. New York, NY, USA, ACM Press, (2006)
J. Vanhoenacker, A. Bryant, и G. Dedene. SIGCPR '99: Proceedings of the 1999 ACM SIGCPR conference on Computer
personnel research, стр. 231--241. New York, NY, USA, ACM Press, (1999)