NURTAZIN, A. T. Complete inductive theory with one countable existentially closed model. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 73, n. 2, p. 62–70, 2012. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/139. Acesso em: 2 jan. 2025.