BOR, H. A note on an inclusion theorem. Tamkang Journal of Mathematics, [S. l.], v. 32, n. 1, p. 39–44, 2001. DOI: 10.5556/j.tkjm.32.2001.366. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/366. Acesso em: 3 may. 2024.