Boichuk О. A., and V. F. Zhuravlev. “Solvability of Integrodifferential Equations With Nondegenerate Kernel in Hilbert Spaces”. Ukrains’kyi Matematychnyi Zhurnal, vol. 75, no. 1, Feb. 2023, pp. 52-61, https://doi.org/10.37863/umzh.v75i1.7394.