Thomi Pilioura Georgios-Dimitrios Kapos Aphrodite Tsalgatidou Seamless Federation of Heterogeneous Service Registries. 86-95 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3182&spage=86 2004 conf/ecweb/2004 EC-Web db/conf/ecweb/ecweb2004.html#PiliouraKT04