CHAND, A.; SEN, N. K.; SINGH, S. Determination of ammonium sulphate in ammonia alum by formaldehyde reaction. Defence Science Journal, [S. l.], v. 12, n. 1, p. 68–78, 2014. DOI: 10.14429/dsj.12.6836. Disponível em: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/6836. Acesso em: 15 jun. 2025.