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  1. Duncan, E.B.: Structuring knowledge bases for designers of learning materials (1989) 10.32 
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  2. Duncan, E.B.: ¬A faceted approach to hypertext (1989) 10.32 
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  3. Duncan, E.B.: ¬A concept-map thesaurus as a knowledge-based hypertext interface to a bibliographic database (1990) 10.32 
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