Singh, T. K., S. K. Sharma, and C. L. Jain. “Lead Sulphide-Doped Silica Xerogel by Sol-Gel Technique”. Defence Science Journal 46, no. 2 (January 1, 2013): 105–107. Accessed July 2, 2025. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/4056.