Boichuk, O. A., et al. “Nonlinear Integrodifferential Boundary Value Problems With Deviating Argument Unsolved With Respect to the Derivative”. Ukrains’kyi Matematychnyi Zhurnal, vol. 74, no. 9, Nov. 2022, pp. 1170-81, https://doi.org/10.37863/umzh.v74i9.6707.