MitropolskiyY. A., SamoilenkoA. M., and StrokV. V. “Institute of Mathematics of The Ukrainian National Academy of Sciences: 60 Years of Development”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 46, no. 10, Oct. 1994, pp. 1291–1303, https://umj.imath.kiev.ua/index.php/umj/article/view/5606.