Germán M. Rivera Bernd Simon Juan Quemada Joaquín Salvachúa Improving LOM-Based Interoperability of Learning Repositories. 690-699 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3292&spage=690 2004 conf/otm/2004 OTM Workshops db/conf/otm/otm2004.html#RiveraSQS04