BerezanskyY. M., GorbachukV. I., GorbachukM. L., KorolyukV. S., MitropolskiyY. A., SamoilenkoA. M. and TarasovV. G. (1995) “On the 60th birthday of Leonid Pavlovich Nizhnik”, Ukrains’kyi Matematychnyi Zhurnal, 47(10), pp. 1416–1417. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5536 (Accessed: 27July2024).