Support for this work was provided by grants MDR 8954664 and ESI 9050210 from the National Science Foundation. The opinions expressed, however, are those of the authors and do not necessarily reflect the views of that foundation.
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Publication information: Book title: Designing Learning Environments for Developing Understanding of Geometry and Space. Contributors: Richard Lehrer - Editor, Daniel Chazan - Editor. Publisher: Lawrence Erlbaum Associates. Place of publication: Mahwah, NJ. Publication year: 1998. Page number: 248.