MANAT, M.; SORBI, A. A note on Rogers semilattices of families of two embedded sets in the Ershov hierarchy. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 68, n. 1, p. 4–13, 2011. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/167. Acesso em: 22 dec. 2024.