1. Courtois P.J., Heymans F., Parnas D.L., Concurrent Control with "Readers" and "Writers", CACM 14, 10(1971), 667–668.
2. Hoare C.A.R., Communicating Sequential Processes, In: R.M. McKeag and A.M. Macnaghten (Eds) "On the Construction of Programs", Cambridge University Press, Cambridge 1980.
3. Janicki R., A Characterisation of Concurrency-like Relations, Lecture Notes in Computer Science 70, Springer 1979, 320–333.
4. Janicki R., On the Design of Concurrent Systems, Proc. of the 2nd Conf. on Distributed Computing Systems, Paris 1981, IEEE Press, New York 1981.
5. Janicki R., A Construction of Concurrent Schemes by Means of Sequential Solution and Concurrency Relations, Lecture Notes in Computer Science 107, Springer 1981, 327–334.