Jean-Noël Colin Tien-Dung Le David Massart Mediating Distribution Models and Access Control for the Exchange of Learning Objects. 714-715 2009 ICALT https://doi.org/10.1109/ICALT.2009.29 https://doi.ieeecomputersociety.org/10.1109/ICALT.2009.29 conf/icalt/2009 db/conf/icalt/icalt2009.html#ColinLM09