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JUCS - Journal of Universal Computer Science 4(4): 429-448
doi:
10.3217/jucs-004-04-0429
Published:
28 Apr 1998
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Authors
Peter Brusilovsky 
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Human-Computer Interaction Institute,Carnegie Mellon University, United States of America
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Learning Systems Research and Development Group, Faculty of Education, The University of Technology, Sydney, Australia
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Conflict of interest
The authors have declared that no competing interests exist.
This article is freely available under the J.UCS Open Content License.