A. Plangprasopchok, и K. Lerman. WWW '09: Proceedings of the 18th international conference on World wide web, стр. 781--790. New York, NY, USA, ACM, (2009)
P. Pirolli. CHI '09: Proceedings of the 27th international conference on Human factors in computing systems, стр. 605--614. New York, NY, USA, ACM, (2009)