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  1. Keyser, P. de: Drie belangrijke Belgische bibliografische bestanden op CD-ROM (1999) 10.31
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    Keyser, P. de
  2. Keyser, P. de: Conversions to and from CDS/ISIS : an overview of the possibilities, problems and programs (2000) 10.31
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  3. Keyser, P. de: Indexing : from thesauri to the Semantic Web (2012) 10.31
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