@conference {19828,
	title = {Designing for instrumentalization: constructionist perspectives on instrumental theory},
	booktitle = {Proceedings of the International Symposium {\textquotedblleft}ATATEMLO{\textquotedblright} ({\textquotedblleft}Activity theoretic approaches to technology enhanced mathematics learning orchestration{\textquotedblright})},
	year = {2011},
	pages = {61-70},
	address = {Universit{\'e} Paris Diderot, Paris 7},
	author = {C Kynigos and G Psycharis}
}
