@book{32145,
	author = {Guin, Dominique. and Ruthven, Kenneth. and SpringerLink (Online service)},
	title = {The Didactical Challenge of Symbolic Calculators},
	publisher = {Springer US,},
	year = {2005.},
	series = {Mathematics Education Library ;},
	address = {Boston, MA :},
	url = {http://dx.doi.org/10.1007/b101602}
}