YESHKEYEV, A.R.; ULBRIKHT, O.I. On lattice of existential formulas for fragment of Jonsson set. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 79, n. 3, p. 33–39, 2015. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/44. Acesso em: 7 sep. 2025.