James G. Hayes Effat Peyrovian Sunil K. Sarin Marc-Thomas Schmidt Keith D. Swenson Rainer Weber Workflow Interoperability Standards for the Internet. 37-45 2000 4 IEEE Internet Computing 3 http://doi.ieeecomputersociety.org/10.1109/4236.845389 db/journals/internet/internet4.html#HayesPSSSW00