Shakoor А., et al. “Results for Retarded Nonlinear Integral Inequalities With Mixed Powers and Their Applications to Delay Integro-Differential Equations”. Ukrains’kyi Matematychnyi Zhurnal, vol. 75, no. 3, Apr. 2023, pp. 416-29, https://doi.org/10.37863/umzh.v75i3.6903.