Markus Döhring Christo Klopper Birgit Zimmermann Towards Efficiently Running Workflow Variants by Automated Extraction of Business Rule Conditions. 49-54 2011 Grundlagen von Datenbanken http://ceur-ws.org/Vol-733/paper_doehring.pdf conf/gvd/2011 db/conf/gvd/gvd2011.html#DohringKZ11