1. Ang, T., Brzozowski, J.: Languages convex with respect to binary relations, and their closure properties. Acta Cybernet. 19(2), 445–464 (2009)
2. Berstel, J., Perrin, D., Reutenauer, C.: Codes and Automata (Encyclopedia of Mathematics and its Applications). Cambridge University Press, New York (2010)
3. Brzozowski, J.: Quotient complexity of regular languages. J. Autom. Lang. Comb. 15(1/2), 71–89 (2010)
4. Brzozowski, J.: In search of the most complex regular languages. Int. J. Found. Comput. Sci. 24(6), 691–708 (2013)
5. Lecture Notes in Computer Science;J Brzozowski,2016