5Workflow Management, Coalition. The Workflow Reference Model [R]. WFMC-TC00-1003, 1994.
6Georgakopoulos Overview of Workflow D, Ma Hornick M, Sheth A. An nagement: From Process Modeling to Workflow Automation Infrastructure[J] Distributed and Parallel Databases, 1995, 3(2): 119-153.
7Mohan C. Recent trends in workflow management products, standards and research[R]. 1997.