Lucian Wischik Philippa Gardner Strong Bisimulation for the Explicit Fusion Calculus. 484-498 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2987&spage=484 2004 conf/fossacs/2004 FoSSaCS db/conf/fossacs/fossacs2004.html#WischikG04