@misc
{TN_libero_mab2,
author = {
Leung, Allen
},
title = {
An epistemic model of task design in dynamic geometry environment
},
publisher = {Springer Science and Business Media LLC},
isbn = {1863-9690},
isbn = {1863-9704},
year = {2011},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}