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White, M.J.: Patents and patent searching (2009)
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Tseng, Y.-H.; Lin, C.-J.; Lin, Y.-I.: Text mining techniques for patent analysis (2007)
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Na, S.-H.; Kang, I.-S.; Roh, J.-E.; Lee, J.-H.: ¬An empirical study of query expansion and cluster-based retrieval in language modeling approach (2007)
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