1. van der Aalst, W.M.P.: Interorganizational Workflows: an approach based on message sequence charts and petri nets. Syst. Anal. Model. 34, 335–367 (1999)
2. van der Aalst, W.M.P.: Structural characterizations of sound workflow nets. Computing Science Report 96/23, Eindhoven University of Technology (1996)
3. van der Aalst, W.M.P., et al.: Soundness of workflow nets: classification, decidability, and analysis. Form. Aspects Comput. 23, 333–363 (2011).
https://doi.org/10.1007/s00165-010-0161-4
4. van der Aalst, W., Kindler, E., Desel, J.: Beyond asymmetric choice: a note on some extensions. Petri Net Newsl. 55, 3–13 (1998)
5. Lecture Notes in Computer Science;K Barkaoui,1996