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Geropoulos, S., A. Kameas, P. Pintelas, X. Skourlas, and I. Chalaris,  "Quali_Learn-????????? ??? ???????? ?? ?????? ??????????? ????????? ???? ???????? ??????????",  \i Proceedings of 4rd Panhellenic Conference with International Participation,?Didactic of Mathematics and Informatics in Education?\i0 , Rethimno, Greece, pp. 264-273, 1-3 October, 1999.\par \par }