Diasamidze, Y., Makharadze, S., Aydın, N., & Erdo˘gan, A. (2015). Complete Semigroups of Binary Relations Defined by Semilattices of the Class $Z$−Elementary $X$−Semilattice of Unions. Sarajevo Journal of Mathematics, 11(1), 17–35. https://doi.org/10.5644/SJM.11.1.02