[1]
KorolyukV. S., LukovskyI. O., PerestyukN. A., PratsiovytyiM. V., SamoilenkoA. M., and YakovetsV. P., “Mykola Ivanovych Shkil’ (on his 80th birthday)”, Ukr. Mat. Zhurn., vol. 64, no. 12, pp. 1720-1722, Dec. 2012.