In: D. Dicheva , R. Mizoguchi , J. Greer (editor). Semantic Web Technologies for e-Learning. Chapter 8 A Cross-Curriculum Representation for Handling and Searching Dynamic Geometry Competencies Pages 136-155 The Future of Learning 4 ISBN 978-1-60750-062-9 IOS Press 11/2009.

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German Research Center for Artificial Intelligence
Deutsches Forschungszentrum für Künstliche Intelligenz