1. Alla, H., & David, R. (1987). Continuous Petri nets. In Proceedings of the eighth international workshop on applications and theory of Petri nets (pp. 275–294). Zaragoza, Spain.
2. Continuous and hybrid Petri nets;Alla;Journal of Circuits, Systems, and Computers,1998
3. Supervisory control of Petri nets using routing functions;Alpan;IEEE Transactions on Systems, Man and Cybernetics,2000
4. Alpan, G., & Gaujal, B. (2002). Optimal bus scheduling using continuous Petri nets. Technical report, INRIA.
5. Campos, J., Chiola, C., & Silva, M. (1989). Properties and steady-state performance bounds for Petri nets with unique repetitive firing count vector. In Proceedings of the third international workshop on Petri nets and performance models (pp. 210–220). IFAC, Kyoto, Japan.