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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- Source
- Journal of the American Society for Information Science and Technology. 57(2006) no.4, S.448-461
