Elisabetta Di Nitto Luca Mainetti Mattia Monga Licia Sbattella Roberto Tedesco Supporting Interoperability and Reusability of Learning Objects: The Virtual Campus Approach. 33-50 2006 9 Educational Technology & Society 2 http://www.ifets.info/journals/9_2/4.pdf db/journals/ets/ets9.html#NittoMMST06