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Kopp, O.: Google Hummingbird-Algorithmus-Update : Infos & Hintergründe (2013)
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Hummingbird Neuer Suchalgorithmus bei Google (2013)
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Fiorelli, G.: Hummingbird unleashed (2013)
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Oreskovic, A.: Google introduces new 'Hummingbird' search algorithm (2013)
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Haynes, M.: Your Google algorithm cheat sheet : Panda, Penguin, and Hummingbird (2013)
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