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Lancaster, F.W.: Trends in subject indexing from 1957 to 2000 (1980)
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Wacholder, N.; Byrd, R.J.: Retrieving information from full text using linguistic knowledge (1994)
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Chowdhury, G.G.: Natural language processing (2002)
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Baxter, G.; Anderson, D.: Image indexing and retrieval : some problems and proposed solutions (1995)
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Progress in visual information access and retrieval (1999)
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