SAYED AHMED, T. Omitting Types in Fragments and Extensions of First Order Logic. Bulletin of the Section of Logic, [S. l.], v. 50, n. 3, p. 249–287, 2021. DOI: 10.18778/0138-0680.2021.13. Disponível em: https://czasopisma.uni.lodz.pl/bulletin/article/view/9884. Acesso em: 29 jun. 2022.