H. Lee, A. Borodin, и L. Goldsmith. HT '08: Proceedings of the nineteenth ACM conference on Hypertext and hypermedia, стр. 139--148. New York, NY, USA, ACM, (2008)
Y. Liu, A. Sprague, и E. Lefkowitz. ACM-SE 42: Proceedings of the 42nd annual Southeast regional conference, стр. 402--103. New York, NY, USA, ACM, (2004)