1. Béal, M.P., Crochemore, M., Mignosi, F., Restivo, A., Sciortino, M.: Computing forbidden words of regular languages. Fundamenta Informaticae 56(1,2), 121–135 (2002)
2. Berstel, J., Perrin, D.: Theory of codes. Academic Press, Inc. (1985)
3. Clarke, C.L.A., Cormack, G.V.: On the use of regular expressions for searching text. ACM Transactions on Programming Languages and Systems 19(3), 413–426 (1997)
4. Crochemore, M., Mignosi, F., Restivo, A.: Automata and forbidden words. Information Processing Letters 67(3), 111–117 (1998)
5. Han, Y.S.: Decision algorithms for subfamilies of regular languages using state-pair graphs. Bulletin of the European Association for Theoretical Computer Science 93, 118–133 (2007)