By Zazkis R.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|30|5|631-650

Taylor & Francis Ltd‎(1999)‎

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By Zazkis R.   Liljedahl P.   Gadowsky K.   in Journal of Mathematical Behavior

ISSN:0732-3123|22|4|435-448

Elsevier‎(2003)‎

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