By Farmaki Vassiliki   in Positivity

ISSN:1385-1292|8|1|49-74

Springer Publishing Company ‎(2004)‎

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By Verikios Petros   Farmaki Vassiliki   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|41|4|515-530

Taylor & Francis Ltd‎(2010)‎

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