Jan Hidders Marlon Dumas Wil M. P. van der Aalst Arthur H. M. ter Hofstede Jan Verelst When are two Workflows the Same? 3-11 2005 conf/cats/2005 CATS http://crpit.com/confpapers/CRPITV41Hidders.pdf db/conf/cats/cats2005.html#HiddersDAHV05