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Nicholson, S.; Sierra, T.; Eseryel, U.Y.; Park, J.-H.; Barkow, P.; Pozo, E.J.; Ward, J.: How much of it is real? : analysis of paid placement in Web search engine results (2006)
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Nicholson, S.: ¬A proposal for categorization and nomenclature for Web search tools (2000)
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Nicholson, S.: Raising reliability of Web search tool research through replication and chaos theory (2000)
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