BEREZANSKY, Yu. M.; GORBACHUK, V. I.; GORBACHUK, M. L.; KOSTYUCHENKO, A. G.; KUZHEL', S. A.; MARCHENKO, V. O.; SAMOILENKO, A. M.; SAMOILENKO, Yu. S.; KHRUSLOV, E. Ya. Leonid Pavlovych Nyzhnyk (on his 70-th birthday). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 8, p. 1120–1122, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3669. Acesso em: 6 dec. 2025.