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Wittmann, A.: Classifying and indexing of patent documents : a retired patent documentalist looks back (1994)
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Rampelmann, J.: Classification tools at the EPO (1996)
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Vries, S. de: Points of interest concerning the new IPC (1989)
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Dickens, D.T.: ¬The ECLA classification system (1994)
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Nishikawa, M.: Usefulness of hybrid systems in computerised searches (1990)
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