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- author's%3a%22Leeuwen%2c T.N. van%22 2
- authors%3a%22Leeuwen%2c T.N. van%22 2
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Van der Vet, P.E.; Mars, N.J.I.: Structured system of concepts for storing, retrieving and manipulating chemical information (1993)
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Van der Vet, P.E.; Mars, N.J.I.: Condorcet Query Engine : a query engine for coordinated index terms (1999)
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