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Huang, W.-J.: ¬The definition of ontological and applied information and the trend of information service (1997)
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Lai, K.-K.; Wu, S.-J.: Using the patent co-citation approach to establish a new patent classification system (2005)
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Frâncu, V.: ¬A universal classification system going through changes (2001)
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Willett, P.: Best-match text retrieval (1993)
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Francu, V.: Multilingual access to information using an intermediate language (2003)
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