B.S. BAIZHANOV; S.S. BAIZHANOV. SOME QUESTIONS ON EXTERNAL DEFINABILITY. Известия НАН РК. Серия физико-математическая, [S. l.], n. 6, p. 138–142, 2019. Disponível em: http://189185.vm7pq.group/physics-mathematics/article/view/1700. Acesso em: 22 фев. 2025.