МАНАТ, М. Note on cardinality of Rogers semilattice in the Ershov hierarchy. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 71, n. 4, p. 8–12, 2011. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/214. Acesso em: 22 dec. 2024.