GUSIĆ, Ivica. Convex functions on lattice ordered groups. Annales Mathematicae Silesianae, [S. l.], v. 11, p. 7–20, 1997. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14179. Acesso em: 26 apr. 2025.