@conference {19827,
	title = {Designing and modifying artifacts through actual implementation in mathematics classrooms},
	booktitle = {Proceedings of the Constructionism 2012 Conference},
	year = {2012},
	pages = {281-290},
	address = {Athens},
	author = {Elissavet Kalogeria and Giorgos Psycharis and Kalliopi Ardavani},
	editor = {C Kynigos and J E Clayson and N Yiannoutsou}
}
