By Schwarz M   De Bleser R   Poeck K   Weis J   in Brain

ISSN:1460-2156|121|1|115-126

Oxford University Press‎(1998)‎

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By Poeck K.   Fensel D.   Landes D.   Angele J.   in International Journal of Human-Computer Studies

ISSN:1071-5819|44|3|435-467

Academic Press‎(1996)‎

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