L. Lesmo, A. Mazzei, и D. Radicioni. HT '09: Proceedings of the Twentieth ACM Conference on Hypertext and Hypermedia, New York, NY, USA, ACM, (июля 2009)
M. Montagnuolo, M. Ferri, и A. Messina. HT '09: Proceedings of the Twentieth ACM Conference on Hypertext and Hypermedia, New York, NY, USA, ACM, (июля 2009)
C. Hargood, D. Millard, и M. Weal. HT '09: Proceedings of the Twentieth ACM Conference on Hypertext and Hypermedia, New York, NY, USA, ACM, (июля 2009)