Tim Menzies David Owen Bojan Cukic You Seem Friendly, But Can I Trust You? 208-219 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2699&spage=208 2002 conf/faabs/2002 FAABS db/conf/faabs/faabs2002.html#MenziesOC02