GLAVOSITS, Tamás; SZÁZ, Arpád. General conditions for the subadditivityand superadditivity of relations. Scientia Series A: Mathematical Sciences, [S. l.], v. 11, p. 31–43, 2005. DOI: 10.71712/. Disponível em: https://revistas.usm.cl/scientia/article/view/52.. Acesso em: 7 jun. 2025.