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Na, J.-C.; Neoh, H.L.: Effectiveness of UMLS semantic network as a seed ontology for building a medical domain ontology (2008)
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Ibekwe-SanJuan, F.: Constructing and maintaining knowledge organization tools : a symbolic approach (2006)
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Fagan, J.L.: ¬The effectiveness of a nonsyntactic approach to automatic phrase indexing for document retrieval (1989)
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