“Linear Boundary-Value Problems for Systems of Integro-Differential Equations With a Degenerate Kernel. Resonance Case for a Weakly Perturbed Boundary-Value Problem”. Neliniini Kolyvannya, vol. 25, no. 2, June 2022, pp. 174-83, https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1065.