Shorter Notices. The Pakistan Development Review, [S. l.], v. 47, n. 2, p. pp.222–226, 2008. DOI: 10.30541/v47i2pp.222-226. Disponível em: https://www.thepdr.pk/index.php/pdr/article/view/2262. Acesso em: 6 dec. 2025.