Tevfik Bultan Xiang Fu Jianwen Su Tools for Automated Verification of Web Services. 8-10 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3299&spage=8 2004 conf/atva/2004 ATVA db/conf/atva/atva2004.html#BultanFS04