Bratiichuk, N. S., D. V. Gusak, I. N. Kovalenko, I. O. Lukovsky, V. L. Makarov, I. V. Samoilenko, and A. M. Samoilenko. “Volodymyr Semenovych Korolyuk (on His 90th Birthday)”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 67, no. 8, Aug. 2015, pp. 1151-2, https://umj.imath.kiev.ua/index.php/umj/article/view/2053.