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Document type:
Konferenzbeitrag 
Author(s):
Ufer, S.; Heinze, A.; Reiss, K. 
Title:
What happens in students’ minds when constructing geometry proofs - a cognitive model based on mental models 
Editor:
Lin, F. L.; Hsieh, F. J.; Hanna, G.; de Villiers, M. 
Book / Congress title:
Proof and proving in mathematics education. ICMI Study 19 Conference Proceedings 
Publisher address:
Taipei: Taiwan Normal University 
Year:
2009 
Pages:
239–244