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Micropoulos, T., A. Katsikis, A. Emvalotis, E. Nikolou, A. Xalkidis, P. Pintelas, and A. Kameas,  "EIK?N-??? ?????????????? ???? ?????????? ??? ????????? ??? ???????????-??????????? ??????????",  \i Proceedings of 4rd Panhellenic Conference with International Participation,?Didactic of Mathematics and Informatics in Education?\i0 , Rethimno, Greece, pp. 155-162, 1-3 October, 1999.\par \par }