Emanuela Busetti Giuliana Dettori Paola Forcheri Maria Grazia Ierardi Promoting Teachers' Collaborative Re-use of Educational Materials. 61-73 2006 conf/ectel/2006 EC-TEL http://dx.doi.org/10.1007/11876663_7 db/conf/ectel/ectel2006.html#BusettiDFI06