Liliana Cabral John Domingue Enrico Motta Terry R. Payne Farshad Hakimpour Approaches to Semantic Web Services: an Overview and Comparisons. 225-239 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3053&spage=225 2004 conf/esws/2004 ESWS db/conf/esws/esws2004.html#CabralDMPH04