1. H. Becht, A. Bloesch, R. Nickson, and M. Utting. Ergo 4.1 reference manual. Technical Report 96-31, Software Verification Research Centre, School of Information Technology, The University of Queensland, Brisbane, Australia, Nov 1996.
2. Process algebra versus axiomatic specification of a real-time protocol;Cerone,2000
3. Time-based expressivity of time Petri nets for system specification;Cerone;Theoretical Computer Science,1999
4. C. J. Fidge, I. J. Hayes, B. P. Mahony, and A. K. Wabenhorst. Real-time specification and reasoning using maximal intervals. In Proc. of the 6th Annual Australasian Conference on Parallel and Real-Time Systems (PART'99), pages 344–354, Singapore, 1999. Springer-Verlag.
5. A set-theoretic model for real-time specification and reasoning;Fidge,1998