1. Backhouse, R.: Closure algorithms and the star-height problem of regular languages. Ph.D. thesis, University of London (1975)
2. Bonchi, F., Pous, D.: Checking NFA equivalence with bisimulations up to congruence. In: Proceedings of the Principles of Programming Languages (POPL), pp. 457–468 (2013)
3. Brunet, P., Pous, D., Struth, G.: On decidability of concurrent Kleene algebra. In: Proceedings of the Concurrency Theory (CONCUR), pp. 28:1–28:15 (2017)
4. Conway, J.H.: Regular Algebra and Finite Machines. Chapman and Hall Ltd., London (1971)
5. Foster, N., Kozen, D., Milano, M., Silva, A., Thompson, L.: A coalgebraic decision procedure for NetKAT. In: Proceedings of the Principles of Programming Languages (POPL), pp. 343–355 (2015)