KorolyukV. S., LukovskyI. O., PerestyukN. A., PratsiovytyiM. V., SamoilenkoA. M. and YakovetsV. P. (2012) “Mykola Ivanovych Shkil’ (on his 80th birthday)”, Ukrains’kyi Matematychnyi Zhurnal, 64(12), pp. 1720-1722. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2693 (Accessed: 1September2024).