The didactical challenge of symbolic calculatorsDominique Guin, Kenneth Ruthven, Luc Trouche · First published 2004Open the Tome
Matemcas y educacin. Retos y cambios desde una perspectiva internacionalNria Gorgori, Jordi Deulofeu, Alan Bishop (coords.), Guida de Abreu, Nicolas Balacheff, Ken Clements, Tommy Dreyfus, Fred Goffree, Peter Hilton, Pearla Nesher, Kenneth Ruthven · First published 2003Open the Tome
