Mel’nikV. S., Mel’nykO. M., and SamoilenkoA. M. 2004. “Academician V. Ya. Bunyakovs’kyi (on 200-Th Anniversary of His Birthday)”. Ukrains’kyi Matematychnyi Zhurnal 56 (12), 1675-83. https://umj.imath.kiev.ua/index.php/umj/article/view/3874.