@article{nicholson_sierra_eseryel_park_barkow_pozo_ward_2006, title={How much of it is real? Analysis of paid placement in Web search engine results}, volume={57}, ISSN={["1532-2890"]}, DOI={10.1002/asi.20318}, abstractNote={Abstract}, number={4}, journal={JOURNAL OF THE AMERICAN SOCIETY FOR INFORMATION SCIENCE AND TECHNOLOGY}, author={Nicholson, S and Sierra, T and Eseryel, UY and Park, JH and Barkow, P and Pozo, EJ and Ward, J}, year={2006}, month={Feb}, pages={448–461} }