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  Google Scholar 15 Dec 14

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  Krillion 15 Dec 14

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  Twitter Search 14 Dec 14

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  Live Search Web Service API 14 Dec 14

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  Free PHP Rapidshare Search Engine Script 14 Dec 14

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  Dogpile 15 Dec 14

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  PlagSpotter 14 Dec 14

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  Aggregate Knowledge Pique Discovery Network 15 Dec 14