Andreas Geppert Markus Kradolfer Dimitris Tombros Market-Based Workflow Management. 179-191 http://link.springer.de/link/service/series/0558/bibs/1402/14020179.htm 1998 conf/ifip/1998trec Trends in Distributed Systems for Electronic Commerce db/conf/ifip/trec1998.html#GeppertKT98