1. Y. B. Jun, C. S. Kim and M. S. Kang, Cubic subalgebras and ideals of BCK/BCI-algebras, Far East Journal of Mathematical Sciences, 2 (44) 239–250(2010).
2. Y. B. Jun, C. S. Kim, and J. G. Kang, Cubic q-ideals of BCIalgebras, Ann. Fuzzy Math. Inform. 1 (1) 25–34 (2011).
3. Y. B. Jun, C. S. Kim, and K. O. Yang, Cubic sets, Ann. Fuzzy Math. Inform. 4 (1) 83–98 (2012).
4. F.F. Kareem and E. R. Hasan, On KU-semigroups, International Journal of Science and Nature 9(1) 79–84(2018).
5. F.F. Kareem and E. R. Hasan, Bipolar fuzzy k-idealsin KU-semigroups, Journal of New Theory, 9 71–78(2019).