@conference {19839,
	title = {Dynamic manipulation schemes of geometrical constructions: Instrumental genesis as an abstraction process},
	booktitle = {Proceedings of the 30th Conference of the International Group for the Psychology of Mathematics Education (PME 30)},
	volume = {3},
	year = {2006},
	pages = {385-392},
	address = {Prague},
	author = {G Psycharis},
	editor = {J Novotn{\'a} and H Maraov{\'a} and M Kr{\'a}tk{\'a} and N Stehl{\'\i}kov{\'a}}
}
