BoichukО. A., MakarovV. L., and FerukV. A. “A Criterion of Solvability of Resonant equations and Construction of Their Solutions”. Ukrains’kyi Matematychnyi Zhurnal 71, no. 10 (October 25, 2019): 1321-1330. Accessed December 26, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1517.