1. Enterprise-wide workflow management based on state and activity charts;Muth,1998
2. METEOR, (Managing End-To-End OpeRations) Project home page, LSDIS Lab, 2006. Acessed from http://lsdis.cs.uga.edu/projects/past/METEOR/
3. Organizing long-running activities with triggers and transactions;Dayal,1990
4. A workflow system based on active databases;Eder,1994
5. The application of petri nets to workflow management;Aalst;Journal of Circuits, Systems and Computers,1998