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  1. Van der Vet, P.E.: Notes on the foundations of classification theories : a follow-up of what was said at the Elsinore FID/CR conference (1982) 10.31 
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  2. Van der Vet, P.E.; Mars, N.J.I.: Structured system of concepts for storing, retrieving and manipulating chemical information (1993) 10.31 
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  3. Van der Vet, P.E.; Mars, N.J.I.: Condorcet Query Engine : a query engine for coordinated index terms (1999) 10.31 
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