ZHAN, Qian. TWO RESULTS ON THE ABELIAN IDEALS OF A BOREL SUBALGEBRA. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 35, p. 361–368, 2015. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6424. Acesso em: 16 aug. 2026.