ShakoorА., M. Samar, T. Athar, and M. Saddique. “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, doi:10.37863/umzh.v75i3.6903.