1. Models for Concurrency;Winskel,1995
2. Bisimulation from open maps;Joyal;Inform. Comput.,1996
3. Observing behaviour categorically;Cheng,1995
4. M. Bednarczyk, Hereditary history preserving bisimulation or what is the power of the future perfect in program logics, Tech. Rep., Polish Academy of Sciences, 1991
5. Equivalence notions for concurrent systems and refinement of actions;van Glabbeek,1989