Study of Acid Rain in Tikrit City. Tikrit Journal of Engineering Sciences, [S. l.], v. 18, n. 1, p. 69–79, 2011. DOI: 10.25130/tjes.18.1.12. Disponível em: https://tj-es.com/ojs/index.php/tjes/article/view/494.. Acesso em: 9 sep. 2026.