D. Ramage, P. Heymann, C. Manning, и H. Molina. WSDM '09: Proceedings of the Second ACM International Conference on Web Search and Data Mining, стр. 54--63. New York, NY, USA, ACM, (2009)
P. Isenberg, T. Zuk, C. Collins, и S. Carpendale. BELIV '08: Proceedings of the 2008 conference on BEyond time and errors, стр. 1--8. New York, NY, USA, ACM, (2008)