[1] U. Acar, F. Koyuncu, B. Tanay, Soft sets and soft rings, Computers and Mathematics with
Applications, 59 (2010), 3458–3463.
[2] H. Aktacs, N. Cavgman, Soft sets and soft groups, Information Sciences, 177 (2007), 2726–
2735.
[3] M.I. Ali, F. Feng, X. Liu, W.K. Min, M. Shabira, On some new operations in soft set theory,
Computers and Mathematics with Applications, 57(9) (2009), 1547–1553.
[4] R. Ameri, E. Mohammadzadeh, Engel groups derived from hypergroups, European Journal of
Cambinatorics, 44 (2015), 191–197.
[5] R.A. Borzooei, E. Mohammadzadeh, V. Foteata, On engel fuzzy subpolygroups, New Mathematics
and Natural Computation, 139(2) (2017), 195–206.
[6] P. Corsini, Prolegomena of hypergroup theory, Aviani Editore, Tricesimo, 1993.
[7] P. Corsini, V. Leoreanu, Applications of hyperstructure theory, Kluwer Academic Publishers,
Dordrecht, 2003.
[8] B. Davvaz, Polygroup theory and related systems, World Scientific, 2013.
[9] F. Feng, Y.B. Jun, X. Zhao, Soft semirings, Computers and Mathematics with Applications,
56(10) (2008), 2621–2628.
[10] F. Feng, X. Liu, V. Leoreanu-Fotea, Y.B. Jun, Soft sets and soft rough sets, Information
Sciences, 181 (2011), 1125–1137.
[11] D. Freni, Une note sur le cuur dun hypergroup et sur la cloture transitive β∗ de β (A note on
the core of a hypergroup and the transitivitive closure β∗ of β), Rivista di Matematica della
Università di Parma, 8 (1991), 153–156 (in French).
[12] D. Freni, A new charactrization of the derived hypergroup via strongly regular equivalences,
Communications in Algebra, 30(8) (2002), 3977–3989.
[13] M. Hassanzadeh, A. Pormirzaei, S. Kayvanfar, On the nilpotency of pair of groups, Southeast
Asian Bulletin of Mathematics, 37 (2013), 67–77.
[14] T.W. Hungerford, Graduate tex in mathematics, Springer-Verlag New York, Heidelbery Berlin,
1980.
[15] M. Irfan Ali, F. Feng, X. Liu, W.K. Min, M. Shabir, On some new operations in soft set
theory, Computers and Mathematics with Applications, 57 (2009), 1547–1553.
[16] M. Koskas, Groupoides, demi-hypergroups ehypergroupes, Journal de Mathe’matiques Pures
et Applique’es, 49 (1970), 155–192.
[17] P.K. Maji, R. Biswas, A.R. Roy, Soft set theory, Computers and Mathematics with Applications,
45 (2003), 555–562.
[18] [10] P. Majumdar, S.K. Samanta, On soft mappings, Computers and Mathematics with Applications,
60 (2010), 2666–2672.
[19] F. Marty, Sur une Generalization de la Notion de Groupe, in: 8th Congress Math. Scandenaves,
Stockholm, Sweden, (1934), 45–49.
[20] D. Molodtsov, Soft set theory-first results, Computers and Mathematics with Applications,
37(4-5) (1999), 19–31.
[21] D. Molodtsov, The theory of soft sets, URSS Publishers, Moscow, 2004 (in Russian).
[22] E. Ozkan, H. Aydin R. Dikici, Applications of Fibonancci sequences in a finite nilpotent,
Applied Mathematics and Computation, 141 (2003), 565–578.
[23] K. Qin, Z. Hong, On soft equality, Journal of Computational and Applied Mathematics, 234
(2010), 1347–1355.
[24] J. Wang, M. Yina , W. Gu, Soft polygroups, Computers and Mathematics with Applications,
62 (2011), 3529–3537.