TY - CONF T1 - Creating a LO Metadata Profile for Distance Learning: An Ontological Approach. T2 - MTSR Y1 - 2012 A1 - Nikolopoulos, George A1 - Kalou, Aikaterini K A1 - Christos J. Pierrakeas A1 - Kameas, Achilles JF - MTSR ER -