BALCHEV, S. .; SZEPTYCKI, P. . Finite Betweenness Relational Structures Are Not Fraïssé. Sarajevo Journal of Mathematics, [S. l.], v. 19, n. 1, p. 99–103, 2024. DOI: 10.5644/SJM.19.01.08. Disponível em: https://sjm.anubih.ba/index.php/sjm/article/view/139. Acesso em: 15 oct. 2024.