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Importance of semiotic representations : how CAS can help / Giovannina Albano, Matteo Desiderio .
In: Proceedings of the 8th International Conference on Technology in Mathematics Teaching [x, 46 s. + 1 CD-ROM]. ISBN 978-80-7041-285-5 (brož.) International Conference on Technology in Mathematics Teaching. Hradec Králové : Gaudeamus, 2007. s. 3 .