1. Observation equivalence as a testing equivalence;Abramsky;Theoret. Comput. Sci.,1987
2. The Aloha system — another alternative for Computer communications;Abramson,1970
3. Process algebra;Baeten,1990
4. Process algebra with asynchronous communication mechanisms;Bergstra,1984
5. A semantics for ML concurrency primitives;Berry,1992