1. Agichtein, E.; Brill, E.; Dumais, S.: Improving web search ranking by incorporating user behavior information. In Proc. 29th Annual International ACM SIGIR Conference, Seattle, WA, USA. Association for Computing Machinery, New York, N.Y, 2006; pp. 19–26.
2. Agichtein, E., Gabrilovich, E.. Zha, H: The Social Future of Web Search: Modeling, Exploiting, and Searching Collaboratively Generated Content. In: IEEE Data Engineering Bulletin, 2009, 32; p. 12.
3. Baeza-Yates, R.; Raghavan Prabhakar: Chapter 2: Next Generation Web Search. In (Ceri, S.; Brambilla, M. Eds.): Search Computing. Challenges and Directions. Springer Berlin Heidelberg; Springer-Verlag Berlin Heidelberg, Berlin, Heidelberg, 2010; pp. 11–23.
4. Baeza-Yates, R.; Ribeiro-Neto, B.: Modern information retrieval. The concepts and technology behind search. Addison Wesley, New York, 2011.
5. Battelle, J.: The Search — How Google and Its Rivals Rewrote the Rules of Business and Transformed Our Culture; Portfolio (Penguin Group), New York, 2005.