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Liu, S.; Svenonius, E.: DORS: DDC online retrieval system (1991)
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Rozov, B.: About patent classification (1993)
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Slavic, A.; Cordeiro, M.I.: Core requirements for automation of analytico-synthetic classifications (2004)
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Sebastiani, F.: Classification of text, automatic (2006)
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Hafer, M.A.; Weiss, S.F.: Word segmentation by letter successor varieties (1974)
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