1. Liu, J.W.S.: Real-Time System. Prentice-Hall, Englewood Cliffs (2000)
2. Alur, R., Dill, D.L.: A theory of timed automatoa. Theoretical Computer Science 126, 183–235 (1994)
3. Buttazzo, G.C.: Hard Real-Time Computing Systems. Kluwer Academic Publishers, Dordrecht (1987)
4. Milner, R.: Operational and Algebraic Semantics of Concurrent Processes. In: Handbook of Theoretical Computer Science, pp. 1201–1242. MIT Press, Cambridge (1990)
5. Lecture Notes in Computer Science;R. Alur,1994