[1]
L.A. Zadeh, Fuzzy sets, Information and Control, vol. 8, Jun. 1965, pp.338-353.
Google Scholar
[2]
N. Kehayopulu and M. Tsingelis, Fuzzy sets in ordered groupoids, , Semigroup Forum, vol. 65, Jun. 2002, pp.128-132.
DOI: 10.1007/s002330010079
Google Scholar
[3]
N. Kehayopulu and M. Tsingelis, Regular ordered semigroups in terms of fuzzy subset, Information Sciences, vol. 176, Dec. 2006, pp.3675-3693.
DOI: 10.1016/j.ins.2006.02.004
Google Scholar
[4]
Y. Yin and H. Li, The characterization of regular and intra-regular ordered semigroups, Italian Journal of Pure and Applied Mathematics, vol. 24, 2008, pp.41-52.
Google Scholar
[5]
P.M. Pu and Y.M. Liu, Fuzzy topology I: neighbourhood structure of a fuzzy point and MooreCS mith convergence, Journal of Mathematical Analysis and Applications , vol. 76, 1980, pp.571-599.
DOI: 10.1016/0022-247x(80)90048-7
Google Scholar
[6]
S.K. Bhakat and P. Das, fuzzy subgroups, Fuzzy Sets and Systems, vol. 80, 1996, pp.359-368.
DOI: 10.1016/0165-0114(95)00157-3
Google Scholar
[7]
A. Khan, Y.B. Jun and M. Shabir, Characterizations of ordered semigroups in terms of-fuzzy interior ideals, Neural Computing and Applications, vol. 21, 2012, pp.433-440.
DOI: 10.1007/s00521-010-0463-8
Google Scholar
[8]
Y.B. Jun, A. Khan and M. Shabir, Ordered semigroups characterized by their -fuzzy bi-ideals, Bulletin of the Malaysian Mathematical Sciences Society, vol. 32, 2009, pp.391-408.
Google Scholar