RomanyukA. S., and SamoilenkoA. M. “Bogolyubov Readings-2008. International Conference "Differential Equations, Theory of Functions and Applications" (on the Occasion of the 70th Anniversary of Academician AM Samoilenko)”. Ukrains’kyi Matematychnyi Zhurnal 60, no. 12 (December 25, 2008): 1722. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3285.