@conference {19836,
	title = {Exploring angle through geometrical constructions in a simulated 3D space},
	booktitle = {Eleventh International Congress on Mathematical Instruction (ICMI 11), Topic Study Group 22: {\textquotedblleft}New Technologies in the Teaching and Learning of Mathematics{\textquotedblright}},
	year = {2008},
	address = {Monterrey, Mexico},
	author = {G Psycharis and C Kynigos}
}
