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Richter-Gebert, J., & Kortenkamp U.  (2001).\'a0\'a0Grundlagen Dynamischer Geometrie.  (Henn, H-W., Elschenbroich H-J., & Gawlick T., Ed.).\ul Zeichnung ? Figur ? Zugfigur. \ul0  123?144.\par \par Kortenkamp, U. H., & Richter-Gebert J.  (1998).\'a0\'a0Geometry and education in the Internet age.  (Ottmann, T., & Tomek I., Ed.).\ul Ed-Media & Ed-Telecom 98. Proceedings of the Tenth World Conference on Educational Multimedia and Hypermedia & World Conference on Educational Telecommunications, Freiburg, Germany, June 20-25, 1998. \ul0  \par \par Richter-Gebert, J., & Kortenkamp U.  (1997).\'a0\'a0Geometry and education in the Internet age.  \ul \ul0  \par \par }