[3] C. L. Chang, Fuzzy topological space, Journal of Mathematical Analysis and Applications,
24 (1968), 182{190.
[4] M. Ciric, J. Ignjatovic, I. Jancic and N. Damljanovic, Computation of the greatest simulations
and bisimulations between fuzzy automata, Fuzzy Sets and Systems, 208 (2012), 22{42.
[5] M. Gehrke, S. Grigorieff and J. E. Pin, Duality and equational theory of regular languages,
Lect. Notes Comp.Sci. (ICALP), 5152 (2008), 246{257.
[6] M. Gehrke, Stone duality and the recognisable languages over an algebra, Algebra and Coal-
gebra in Computer Science Lecture Notes in Computer Science, 5728 (2009), 236{250.
[7] M. Gehrke, Duality and recognization, 36th International Conference on Mathematical Foun-
dations of Computer Science, Spinger-Verlag, 6907 (2011), 3{18.
[8] M. Hall, A topology for free groups and related groups, Annals of Mathematics, 52 (1950),
127{139.
[9] J. Ignjatovic, M. Ciric and S. Bogdanovic, Determinization of fuzzy automata with member-
ship values in complete residuated lattices, Information Sciences, 178 (2008), 164{180.
[10] J. Ignjatovic, M. ciric, S. Bogdanovic and T. Petkovic, Myhill-Nerode type theory for fuzzy
languages and automata, Fuzzy Sets and Systems, 161 (2010), 1288{1324.
[11] Z. Jancic and M. Ciric, Brzozowski type determinization for fuzzy automata, Fuzzy Sets and
Systems, 249 (2014), 73{82.
[12] Y. M. Liu and M. K. Luo, Fuzzy Topology, World Scientific Press, Sigapore, 1997.
[13] Y. M. Liu and D. X. Zhang, Lowen Spaces, Math. Anal. Appl., 241 (2000), 30{38.
[14] R. Lowen, Fuzzy topological spaces and fuzzy compactness, Math. Anal. Appl., 56 (1976),
621{633.
[15] E. T. Lee and L. A. Zadeh, Note on fuzzy languages, Information Sciences, 1 (1969), 421{434.
[16] Y. M. Li and W. Pedrycz, Fuzzy finite automata and fuzzy regular expressions with member-
ship values in lattice-ordered monoids, Fuzzy Sets and Systems, 156 (2005), 68{92.
[17] J. N. Mordeson and D. S. Malik, Fuzzy Automata and Languages: Theory and Applications,
Boca Raton, London: Chapman & Hall/CRC, 2002.
[18] J. E. Pin, Profinite methods in automata theory, 26th International Symposium on Theoret-
ical Aspects of Computer Science, (2009), 31{50.
[19] J. E. Pin and H. Straubing, Some results on C-varieties, Theoret. Informatics Appl., 39
(2005), 239{262.
[20] H. Y. Pan, Y. M. Li, Y. Z. Cao and P. Li, Nondeterministic fuzzy automata with membership
values in complete residuated lattices, International Journal of Approximate Reasoning, 82
(2017), 22{38.
[21] N. Pippenger, Regular languages and stone duality, Theory of Computing Systems, 30 (1989),
121{134.
[22] D. W. Qiu, Automata theory based on complete residuated lattice-valued logic (I), Science in
China, 44 (2001), 419{429.
[23] D. W. Qiu, Automata theory based on complete residuated lattice-valued logic (II), Science
in China, 45 (2002), 442{452.
[24] D. W. Qiu, Pumping lemma in automata theory based on complete residuated lattice-value
logic: A note, Fuzzy Sets and Systems, 157 (2006), 2128{2138.
[25] E. S. Santos, Maximin automata, Inf. Control., 12 (1968), 367{377.
[26] E. S. Santos, On reduction of max-min machines, J. Math. Anal. Appl., 37 (1972), 677{686.
[27] S. Shirali and H. L. Vasudeva, Metric Spaces, Springer, 2006.
[28] A. K. Srivastava and S. P. Tiwari, A topology for fuzzy automata, in: Proc. 2002 AFSS
Internat. Conf. on Fuzzy Systems, Lecture Notes in Artfiicial Intelligence, Springer, Berlin,
2275 (2002), 485{490.
[29] A. K. Srivastava and S. P. Tiwari, On relationships among fuzzy approximation operators,
fuzzy topology, and fuzzy automata, Fuzzy Sets and Systems, 138 (2003), 197{204.
[30] S. P. Tiwari and A. K. Singh and S. Sharan and V. K. Yadav, Bifuzzy core of fuzzy automata,
Iranian Journal of Fuzzy Systems, 12(2) (2015), 63-73.