E. Adar, J. Teevan, и S. Dumais. CHI '08: Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, стр. 1197--1206. New York, NY, USA, ACM, (2008)
J. Teevan, C. Alvarado, M. Ackerman, и D. Karger. CHI '04: Proceedings of the 2004 conference on Human factors in computing systems, стр. 415--422. ACM Press, (2004)