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Wittmann, C.: Subheadings in award-winning book indexes : a quantitative evaluation (1990)
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Wittmann, C.: Limitations of indexing modules in word-processing software (1991)
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Wittmann, A.: Classifying and indexing of patent documents : a retired patent documentalist looks back (1994)
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Wittmann, R.: Geschichte des deutschen Buchhandels : ein Überblick (1991)
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