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2. Aggregating inconsistent information: ranking and clustering;Ailon,2005
3. Allen, J., 2009. Comparison of metasearch engines. Tech. rep., Southern Methodist University, CSE8337. Available at http://jdadesign.net/wp-content/uploads/2010/01/HW2b.pdf
4. Metasearch consistency;Aslam,2001
5. Models of metasearch;Aslam,2001