1. Abdulla, P., Deneux, J., Kaati, L., Nilsson, M.: Minimization of non-deterministic automata with large alphabets. In: CIAA, pp. 31–42 (2006)
2. Goldstine, J., Kappes, M., Kintala, C., Leung, H., Malcher, A., Wotschke, D.: Descriptional complexity of machines with limited resources. J. Univ. Comp. Science 8(2), 193–234 (2002)
3. Gramlich, G., Schnitger, G.: Minimizing NFAs and regular expressions. JCSS 73(6), 908–923 (2007)
4. Lecture Notes in Computer Science;H. Gruber,2006
5. Gruber, H., Holzer, M.: Computational complexity of NFA minimization for finite and unary languages. In: LATA, pp. 261–272 (2007)