M. Cerulli, A. Chioccariello, and E. Lemut. Proceedings of the Fourth Congress of the European Society for Research in Mathematics Education (CERME 4), page 591-600. Sant Feliu de Guíxols, Spain,, (2005)
M. Cerulli, E. Chioccariello, and E. Lemut. Proceedings of CERME 4, Fourth Congress of the European Society for Research in Mathematics Education 17 - 21 February 2005 in Sant Feliu de Guíxols, Spain YERME day: 16- 17 February., ERME, (February 2005)
M. Cerulli, E. Chioccariello, and E. Lemut. Proceedings of CERME 4, Fourth Congress of the European Society for Research in Mathematics Education 17 - 21 February 2005 in Sant Feliu de Guíxols, Spain YERME day: 16- 17 February., ERME, (February 2005)