1. R. Alur and D. Dill, Automata for Modelling Real-Time Systems, LNCS No. 443, 1990.
2. R. Alur, C. Courcoubetis and D. Dili, Model-Checking for Real-Time Systems, Proceedings from LICS'90 pp. 414–425, 1990.
3. A. Auziņš, J. Bārzdiņš, J. Bičevskis, K. Čerāns and A. Kalniņš, Automatic Construction of Test Sets: Theoretical Approach, Baltic Computer Science, LNCS, No. 502, 1991.
4. B. Berthomieu and M.Menasche, An Enumerative Approach for Analyzing Time Petri Nets, Proc. IFIP Congress, 1983, North-Holland, 1983.
5. CCITT Specification and Description Language (SDL), Recomendations Z.100, 1988.