1. Observation equivalence as a testing equivalence;Abramsky;Theoret. Comput. Sci.,1987
2. A term model for CCS;Hennessy,1980
3. Compositional proofs by partial specifications of processes;Larsen,1988
4. A Calculus of Communicating Systems;Milner,1980
5. A modal characterization of observable machine-behaviour;Milner,1981