SINGH, T. K.; SHARMA, S. K.; JAIN, C. L. Lead Sulphide-Doped Silica Xerogel by Sol-gel Technique. Defence Science Journal, [S. l.], v. 46, n. 2, p. 105–107, 2013. DOI: 10.14429/dsj.46.4056. Disponível em: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/4056. Acesso em: 7 jul. 2025.