Germán M. Rivera Bernd Simon Juan Quemada Joaquín Salvachúa Improving LOM-Based Interoperability of Learning Repositories. 690-699 http://dx.doi.org/10.1007/978-3-540-30470-8_80 2004 conf/otm/2004 OTM Workshops db/conf/otm/otm2004.html#RiveraSQS04