Shorter Notices. The Pakistan Development Review, [S. l.], v. 38, n. 2, p. pp.227–233, 1999. DOI: 10.30541/v38i2pp.227-233. Disponível em: https://www.thepdr.pk/index.php/pdr/article/view/1616. Acesso em: 6 dec. 2025.