On weak crytical partially ordered sets relative to positively definite Tits quadratic form. Neliniini Kolyvannya, [S. l.], v. 11, n. 3, p. 396–408, 2008. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/488. Acesso em: 12 apr. 2026.