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An Investigation of 8th Grade Students' Knowledge on Geometrical Objects in Terms of Van Heile Levels of Understanding Geometry
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Examining the influence of van Hiele theory-based instructional activities on elementary preservice teachers' geometry knowledge for teaching 2-D shapes - ScienceDirect
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PDF] Improving Students' Van Hiele Level of Geometric Thinking Using Geometer's Sketchpad. | Semantic Scholar
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