KOZUBOVSKAYA, I. G. On defence of theses at Academic Council of the Institute of Mathematics of the Academy of Sciences of the Ukrainian SSR in 1970—1971 . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 4, p. 564–568, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8594. Acesso em: 6 dec. 2025.