[1] R. Biswas, Rosenfeld’s fuzzy subgroups with interval-valued membership functions, Fuzzy Sets
and Systems, 63 (1995), 87-90.
[2] D.B. Delice, S. Erol, On subhypergroups of cyclic hypergroups, Journal of Algebraic Hyperstructures
and Logical Algebras, 3(2) (2022), 59–68.
[3] N. Chen, N. Xie, Uncertainty representation and information measurement of grey numbers,
Grey Systems: Theory and Application, 10(4) (2020), 495–512.
[4] F.J. Cheng, S.H. Hui, Y.C. Chen, Reservoir operation using grey fuzzy stochastic dynamic
programming, Hydrological Processes, 16 (2002), 2395–408.
[5] P. Corsini, Prolegomena of hypergroup theory, Second Edition, Aviani Editor, 1993.
[6] B. Davvaz, V. Leoreanu-Fotea, Hyperring theory and applications, International Academic
Press, USA, 2007.
[7] J. Deng, Introduction to grey system theory, Grey Systems: Theory and Application, 1(1)
(1989), 1–24.
[8] M. Hamidi, On neutro-d-subalgebras, Journal of Algebraic Hyperstructures and Logical Algebras,
2(2) (2021), 13–23.
[9] M. Hamidi, V. Leoreanu-Fotea, On (2-closed) regular hypergroups, Scientific Bulletin-
University Politehnica of Bucharest, Series A, 80(4) (2018), 173–186.
[10] M. Hamidi, K. Norouzi, A. Rezaei, On grey graphs and their applications in optimization,
Applied Mathematics and Optimization, 6(2) (2021), 79–96.
[11] T.J.Y. Lea, D. Joseph, E.A. Temgoua, Residuated lattices derived from filters(ideals) in double
Boolean algebras, Journal of Algebraic Hyperstructures and Logical Algebras, 3(2) (2022), 25–
45.
[12] Y. Lin, M.Y. Chen, S.F. Liu, Theory of grey systems: Capturing uncertainties of grey information,
Kybernetes, 33(2) (2004), 196–218.
[13] S.F. Liu, Y.G. Dang, Z.G. Fang, Grey systems theory and its applications, The Science Press
of China, Beijing, 2004.
[14] S. Liu, Z. Fang, Y. Yang, J. Forrest, General grey numbers and their operations, Grey Systems:
Theory and Application, 2(3) (2012), 341–349.
[15] S. Liu, Y. Lin, Grey information, Theory and Practical Applications, Springer-Verlag, London,
2006.
[16] D. Luo, Z. Huihui, Grey clustering model based on kernel and information field, Grey Systems:
Theory and Application, 10(1) (2020), 56–67.
[17] F. Marty, Sur une generalization de la notion de groupe, In 8th Congress Math. Scandenaves.,
Stockholm, (1934), 45–49.
[18] C.G. Massouros, G.G. Massouros, An overview of the foundations of the hypergroup theory,
Mathematics, 9(9) (2021), 1014.
[19] R. Mierzwiak, M. Nowak, N. Xie, A new approach to the degree of greyness, Grey Systems:
Theory and Application, 11(2) (2020), 241–252.
[20] J.N. Mordeson, P.S. Nair, Fuzzy graph and fuzzy hypergraph, Physica-Verlag, Heidelberg New
Yourk, 2000.
[21] Y. Yang, R. John, Grey sets and greyness, Journal of Information Science, 185(1) (2012),
249–264.
[22] K. Yin, J. Xu, X. Li, A new grey comprehensive relational model based on weighted mean
distance and induced intensity and its application, Grey Systems: Theory and Application,
9(3) (2019), 374–384.
[23] K. Yin, T. Xu, X. Li, Y. Cao, A study of the grey relational model of interval numbers for
panel data, Grey Systems: Theory and Application, 11(1) (2021), 200–211.
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