Overlap in Web Search Results: A Study of Five Search Engines
Rafiq Ahmad Rather, Fayaz Ahmad Lone, Gulam Jeelani Shah · Lincoln (University of Nebraska) · 2008
This paper presents the results of an empirical investigation that measured the degree of overlap between the results retrieved through Google, Altavista, Hotbot, Scirus, and Bioweb using twenty queries in biotechnology. Among the selected search engines, Hotbot had the most overlap (followed by Google) with other search engines except Bioweb. Compound and complex queries produced more overlap than simple queries.