KorolyukV. S., PortenkoN. I., and SamoilenkoA. M. “Anatolii Volodymyrovych Skorokhod”. Ukrains’kyi Matematychnyi Zhurnal 63, no. 6 (June 25, 2011): 859 -864. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2770.