By Kolovou Angeliki   Heuvel-Panhuizen Marja Van Den   in International Journal of Continuing Engineering Education and Life-Long Learnin

ISSN:1560-4624|20|2|224-238

Inderscience Publishers‎(2010)‎

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By van den Heuvel-Panhuizen Marja   Kolovou Angeliki   Robitzsch Alexander   in Educational Studies in Mathematics

ISSN:0013-1954|84|3|281-307

Springer Publishing Company ‎(2013)‎

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