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"PIGP: A Pen-Based Intelligent Dynamic Lecture System for Geometry Teaching."
Yuanyuan Liu, Qiang Lin, Guozhong Dai (2007)
- Yuanyuan Liu, Qiang Lin, Guozhong Dai:

PIGP: A Pen-Based Intelligent Dynamic Lecture System for Geometry Teaching. Edutainment 2007: 381-390

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