Gustavo Gutiérrez-Carreón Thanasis Daradoumis Josep Jorba A Conceptual Model for Grid Learning Services Automatic Composition. 40-41 2007 conf/otm/2007-w1 OTM Workshops (1) http://dx.doi.org/10.1007/978-3-540-76888-3_20 db/conf/otm/otm2007-w1.html#Gutierrez-CarreonDJ07