Shorter Notices. The Pakistan Development Review, [S. l.], v. 27, n. 1, p. pp.84–86, 1988. DOI: 10.30541/v27i1pp.84-86. Disponível em: https://www.thepdr.pk/index.php/pdr/article/view/818. Acesso em: 6 dec. 2025.