Voir la notice de l'article provenant de la source Heldermann Verlag
@article{JGG_2009_13_1_JGG_2009_13_1_a10, author = {C. Leopold }, title = {Virtual and {Real} {Geometry} {Learning} {Environments}}, journal = {Journal for geometry and graphics}, pages = {121--13}, publisher = {mathdoc}, volume = {13}, number = {1}, year = {2009}, url = {http://geodesic.mathdoc.fr/item/JGG_2009_13_1_JGG_2009_13_1_a10/} }
C. Leopold . Virtual and Real Geometry Learning Environments. Journal for geometry and graphics, Tome 13 (2009) no. 1, pp. 121-13. http://geodesic.mathdoc.fr/item/JGG_2009_13_1_JGG_2009_13_1_a10/