BEREZANSKY, Yu. M.; GORBACHUK, V. I.; GORBACHUK, M. L.; KOROLYUK, V. S.; MITROPOLSKIY, Yu. A.; SAMOILENKO, A. M.; TARASOV, V. G. On the 60th birthday of Leonid Pavlovich Nizhnik. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 10, p. 1416–1417, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5536. Acesso em: 5 dec. 2025.