D. Zhang, und W. Lee. WWW '04: Proceedings of the 13th international conference on World Wide Web, Seite 472--481. New York, NY, USA, ACM Press, (2004)
H. Takano, und T. Winograd. HYPERTEXT '98: Proceedings of the ninth ACM conference on Hypertext and hypermedia : links, objects, time and space---structure in hypermedia systems, Seite 297--298. New York, NY, USA, ACM Press, (1998)
Y. Mareek, und I. Shaul. Proceedings of the fifth international World Wide Web conference on Computer networks and ISDN systems, Seite 1321 -- 1333. Amsterdam, The Netherlands, Elsevier Science Publishers B. V., (Mai 1996)