1. Lect Notes Comput Sci;W.M.P. Aalst van der,1997
2. Aalst. WMP van der (1998). The Application of Petri Nets to Workflow Management. The Journal of Circuits, Systems and Computers, 8(1):21–66, 1998.
3. Butler Report. Workflow: Integrating the Enterprise. The Butler Group, 1996.
4. Reichert M and Dadam P (1997). ADEPTflex–Supporting Dynamic Changes of Workflow without loosing control. Journal of Intelligent Information Systems (JIIS), Special Issue on Workflow and Process Management.
5. Carlsen S (1997). Conceptual Modeling and Composition of Flexible Workflow Models. PhD Thesis. Department of Computer Science and Information Science, Norwegian University of Science and Technology, Norway, 1997.