MitropolskiyY. A., and StrokV. V. “50 Years of ‘Ukrainskii Matematicheskii Zhurnal’”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 51, no. 5, May 1999, pp. 579–580, https://umj.imath.kiev.ua/index.php/umj/article/view/4644.