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Björklund, L.; Olander, B.; Smith, L.C.: ¬The personal hypercatalog (1989)
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Churcher, P.R.: ¬A common notation for knowledge representation, cognitive models, learning and hypertext (1989)
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Waterworth, J.A.; Chignell, M.H.: ¬A manifesto for hypermedia usability research (1989)
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Björklund, L.; Olander, B.: ¬The mystery cat : the modern magician (1989)
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Kinnell, S.; Richards, T.: ¬An online interface within a hypertext system : Project Jefferson's electronic notebook (1989)
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Duncan, E.B.: Structuring knowledge bases for designers of learning materials (1989)
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Duncan, E.B.: ¬A faceted approach to hypertext (1989)
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