Thomas S. Heinze Wolfram Amme Simon Moser A Restructuring Method for WS-BPEL Business Processes Based on Extended Workflow Graphs. 211-228 2009 BPM http://dx.doi.org/10.1007/978-3-642-03848-8_15 conf/bpm/2009 db/conf/bpm/bpm2009.html#HeinzeAM09