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Hunter, E.J.: Classification - made simple (1987)
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Rowley, J.E.: Organising knowledge : An introduction to information retrieval (1987)
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Rijsbergen, C.J. van: Information retrieval (1979)
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Chu, H.: Information representation and retrieval in the digital age (2010)
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Kowalski, G.J.; Maybury, M.T.: Information storage and retrieval systems : theory and implemetation (2000)
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