Isabel Azevedo Constatino Martins Eurico Carrapatoso Carlos Vaz de Carvalho A Model for the Effective Reuse of Learning Objects in Repositories. 56-57 2006 conf/icalt/2006 ICALT http://doi.ieeecomputersociety.org/10.1109/ICALT.2006.23 db/conf/icalt/icalt2006.html#AzevedoMCC06