MitropolskyY. A., KurpelN. S., LuchkaA. and SheveloV. N. (1971) “Yuri Dmitrievich Sokolov ”, Ukrains’kyi Matematychnyi Zhurnal, 23(2), p. 281. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/8516 (Accessed: 24November2024).