RAJA, P.; VAEZPOUR, S.M. Convexity in normed hypervector spaces. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 28, p. 7–16, 2011. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6022. Acesso em: 16 sep. 2026.