George Samaras Kyriakos Karenos Eleni Christodoulou A Grid Service Framework for Metadata Management in Self-e-Learning Networks. 260-270 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3165&spage=260 2004 conf/eagc/2004 European Across Grids Conference db/conf/eagc/eagc2004.html#SamarasKC04