عبد رجب م. Production of Calcium Sulfide from reaction Carbon with Iraqi "gypsum". College of Basic Education Research Journal, [S. l.], v. 10, n. 3, p. 576–582, 2011. Disponível em: https://moss.uomosul.edu.iq/index.php/berj/article/view/38758. Acesso em: 26 oct. 2025.