International Business Machines Corporation. Intra-enterprise business process management[EB/OL].[2007-01-29]. http://www.redbooks.ibm.com/redbooks/pdfs/sg246173.pdf.
[2]
HOLLINGSWORTH D. The workflow reference model : 10 years on[EB/OL].[2007-01-29]. http://www.wfmc.org/standards/docs/ Ref_Model_10_years_on_Hollingsworth.pdf.