Jan Mendling Boudewijn F. van Dongen Wil M. P. van der Aalst On the Degree of Behavioral Similarity between Business Process Models. 39-58 2007 EPK http://ceur-ws.org/Vol-303/epk2007-paper3.pdf conf/epk/2007 db/conf/epk/epk2007.html#MendlingDA07