KHAN, Z.; JAVAID, A. From smoke to smokeless; killing the switch. Pakistan Journal of Chest Medicine, [S. l.], v. 24, n. 2, p. 62–63, 2018. Disponível em: http://www.pjcm.net/index.php/pjcm/article/view/514. Acesso em: 30 apr. 2026.