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Rampelmann, J.: Classification tools at the EPO (1996)
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Dickens, D.T.: ¬The ECLA classification system (1994)
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Wittmann, A.: Classifying and indexing of patent documents : a retired patent documentalist looks back (1994)
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Blake, P.: ¬The arrival of free patent information : Internet provision of patent information for free is affecting vendors (1998)
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