BONDARENKO, V. M.; STEPOCHKINA, M. V. Description of posets critical with respect to the nonnegativity of the quadratic Tits form. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 61, n. 5, p. 611–624, 2009. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3045. Acesso em: 5 dec. 2025.