The Problem of Weak Bisimulation up to

Davide Sangiorgi, Robin Milner. The Problem of Weak Bisimulation up to . In Rance Cleaveland, editor, CONCUR 92, Third International Conference on Concurrency Theory, Stony Brook, NY, USA, August 24-27, 1992, Proceedings. Volume 630 of Lecture Notes in Computer Science, pages 32-46, Springer, 1992.