Importance of semiotic representations

ALBANO, Giovannina - DESIDERIO, Matteo. Importance of semiotic representations : how CAS can help. 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.