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PBL-protocols: Guiding and controlling problem based learning processes in virtual learning environments

2000 , Miao, Y. , Holst, S. , Haake, J.M. , Steinmetz, R.

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An Activity-Oriented Approach to Visually Structured Knowledge Representation for Problem-Based Learning in Virtual Learning

2000 , Miao, Y. , Holst, S. , Holmer, T. , Fleschutz, J.M. , Zentel, P.