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Oreskovic, A.: Google introduces new 'Hummingbird' search algorithm (2013)
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Walhout, J.; Oomen, P.; Jarodzka, H.; Brand-Gruwel, S.: Effects of task complexity on online search behavior of adolescents (2017)
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Spink, A.; Jansen, B.J.; Blakely, C.; Koshman, S.: ¬A study of results overlap and uniqueness among major Web search engines (2006)
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Bar-Ilan, J.; Levene, M.; Mat-Hassan, M.: Methods for evaluating dynamic changes in search engine rankings : a case study (2006)
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Thelwall, M.; Binns, R.; Harries, G.; Page-Kennedy, T.; Price, L.; Wilkinson, D.: Custom interfaces for advanced queries in search engines (2001)
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