NIKOLAIDOU, Pipina; VOUGIOUKLIS, Thomas. \(H_v\)-Structures and the bar in questionnaires. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 29, p. 341–350, 2012. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6037. Acesso em: 18 jul. 2026.