1. Lect Notes Comput Sci;J.C.M. Baeten,1990
2. Browne, M.C., Clarke, E., Grümberg O.: Characterizing Finite Kripke Structures in Propositional Temporal Logic. Theoretical Computer Science 59(1,2), pp. 115–131, 1998. 381
3. Baeten, J., Weijland, P.: Process Algebras. Cambridge University Press, 1990.
4. Lect Notes Comput Sci;F. Corradini,1995
5. Corradini, F., De Nicola, R. and Labella, A.: A Finite Axiomatization of Non deterministic Regular Expressions. Theoretical Informatics and Applications. To appear. Available from: ftp://rap.dsi.unifi.it/pub/papers/FinAxNDRE . Abstract in FICS, Brno, 1998.