@conference {19824,
	title = {Investigating the potential of computer environments for the teaching and learning of functions: a double analysis from two traditions of research},
	booktitle = {Proceedings of the Eighth Congress of the European Society for Research in Mathematics Education (CERME 8)},
	year = {2013},
	pages = {2624-2633},
	address = {Middle East Technical University, Ankara},
	author = {J-B Lagrange and G Psycharis},
	editor = {U Behiye and {\c C} Haser and M A Mariotti}
}
