BONDARENKO, V. M.; STEPOCHKINA, M. V. $(\min, \max)$-equivalence of posets and nonnegative Tits forms. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 9, p. 1157–1167, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3234. Acesso em: 16 feb. 2026.