URKEN, G.A. Syntactic similarity of definable closures of Jonsson sets. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 90, n. 2, p. 119–123, 2018. DOI: 10.31489/2018m2/119-123. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/232. Acesso em: 23 aug. 2025.