1. Alur, R., Dill, D.L., A Theory of Timed Automata, Theoretical Computer Science, 126, pp. 183–235, 1994.
2. Alur, R., Kurshan, R.P., Timing Analysis in Cospan, Hybrid Systems III, LNCS 1066, pp.220–231, Springer, 1996.
3. Baeten, J. C. M., Bergstra, J. A., Discrete Time Process Algebra, Formal Aspects of Computing 8 (2), pp. 142–148, 1991.
4. Bosnacki, D., Implementing Discrete Time in Promela and Spin, International Conference on Logic in Computer Science, LIRA ‘87, University of Novi Sad, Yugoslavia, 1997. ( Copy also available from the author )
5. Dams, D., Gerth, R., Bounded Retransmission Protocol Revisited, Verification of Infinite Systems Infinity, Bologna, Italy, 1997.