NIKOLOVA, S. RELATIVELY INTRINSICALLY ARITHMETICAL SETS. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 97, p. 41–62, 2005. Disponível em: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/143. Acesso em: 4 dec. 2024.