Nicolas Cuntz Ekkart Kindler On the semantics of EPCs: Efficient calculation and simulation. 7-26 2004 EPK http://www.wiso.uni-hamburg.de/fileadmin/WISO_FS_WI/EPK-Community/epk2004-proceedings.pdf conf/epk/2004 db/conf/epk/epk2004.html#CuntzK04