ChernikovS. N. (1971) “Otto Yulievich Shmidt (on his 80th birth) ”, Ukrains’kyi Matematychnyi Zhurnal, 23(5), pp. 581-585. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/8328 (Accessed: 27July2024).