Izuchukwu, C., et al. “Systems of Variational Inequalities and Multiple-Set Split Equality Fixed-Point Problems for Countable Families of Multivalued Type-One Mappings of the Demicontractive Type”. Ukrains’kyi Matematychnyi Zhurnal, vol. 71, no. 11, Feb. 2026, pp. 1480-01, https://doi.org/10.3842/umzh.v71i11.1530.