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Brousseau, G. (1997). Theory of didactical situations in Mathematics, Kluwer Academic Publishers. Dagdilelis, V. & Papadopoulos, I. (2004). An Open Problem in the Use of Software for Educational Purposes, in E. McKay (Ed.), Proceedings of International Conference on Computers in Education2004, 919-924, RMIT University, Australia. Papadopoulos, I. & Dagdilelis, V. (2006). The Theory of Transactional Distance as a framework for the analysis of computer aided teaching of geometry, International Journal for Technology in Mathematics Education, 13 (4), 175-182. Polya, G. (1973). How to solve it, Princeton: Princeton University Press. , . (2000). , . .

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