Pierpaolo Di Bitonto Vito Leonardo Plantamura Teresa Roselli Veronica Rossano A taxonomy for cataloging LOs using IEEE educational metadata. 139-141 2007 conf/icalt/2007 ICALT http://doi.ieeecomputersociety.org/10.1109/ICALT.2007.40 db/conf/icalt/icalt2007.html#BitontoPRR07