Antonio Sarasa Cabezuelo Jose Manuel Canabal Barreiro Juan Carlos Sacristán Heras Agrega: A Distributed Repository Network of Standardised Learning Objects. 466-474 2009 IWANN (2) http://dx.doi.org/10.1007/978-3-642-02481-8_67 conf/iwann/2009-2 db/conf/iwann/iwann2009-2.html#CabezueloBH09