Korenovskii, A. A., V. S. Korolyuk, V. N. Koshlyakov, and A. M. Samoilenko. “Ivan Oleksandrovych Lukovs’kyi (on His 70-Th Birthday)”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 57, no. 10, Oct. 2005, pp. 1418-9, https://umj.imath.kiev.ua/index.php/umj/article/view/3695.