@conference {19842,
	title = {13 year-olds{\textquoteright} meanings around intrinsic curves with a medium for symbolic expression and dynamic manipulation},
	booktitle = {Proceedings of the 27th Conference of the International Group for the Psychology of Mathematics Education (PME 27)},
	volume = {3},
	year = {2003},
	pages = {165-172},
	address = {CRDG, College of Education, University of Hawai{\textquoteright}I, Honolulu, U.S.A. Hawaii},
	author = {C Κynigos and G Psycharis},
	editor = {N Paterman and B Dougherty and J Zilliox}
}
