BASU, C. K. A class of spaces and their anti spaces. Tamkang Journal of Mathematics, [S. l.], v. 34, n. 4, p. 357–364, 2003. DOI: 10.5556/j.tkjm.34.2003.237. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/237. Acesso em: 29 apr. 2024.