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Haynes, M.: Your Google algorithm cheat sheet : Panda, Penguin, and Hummingbird (2013)
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Rice, R.: Putting sample indexes on your Web site (2000)
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Berinstein, P.: Images in your future : the missing picture in an online search (1997)
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Austin, D.: How Google finds your needle in the Web's haystack : as we'll see, the trick is to ask the web itself to rank the importance of pages... (2006)
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Kelley, D.: Relevance feedback : getting to know your user (2008)
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