Simon Winwood Gerwin Klein Thomas Sewell June Andronick David Cock Michael Norrish Mind the Gap. 500-515 2009 TPHOLs http://dx.doi.org/10.1007/978-3-642-03359-9_34 conf/tphol/2009 db/conf/tphol/tphol2009.html#WinwoodKSACN09