TOMOVSKI, v Z. On a paper of S. Zahid Ali Zenei. Tamkang Journal of Mathematics, [S. l.], v. 33, n. 1, p. 21-24, 2002. DOI: 10.5556/j.tkjm.33.2002.301. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/301. Acesso em: 29 may. 2022.