Boichuk О. A., V. L. Makarov, and V. A. Feruk. 2026. “A Criterion of Solvability of Resonant Equations and Construction of Their Solutions”. Ukrains’kyi Matematychnyi Zhurnal 71 (10): 1321-30. https://doi.org/10.3842/umzh.v71i10.1517.