Leonel Iriarte Navarro Manuel Marco Such Daniel Morón Martin Carlos Pérez-Sancho Pedro Pernías Peco Concept Maps and Learning Objects. 263-265 2005 conf/icalt/2005 ICALT http://doi.ieeecomputersociety.org/10.1109/ICALT.2005.90 db/conf/icalt/icalt2005.html#NavarroSMPP05