Singh, T., S. Sharma, and C. Jain. “Lead Sulphide-Doped Silica Xerogel by Sol-Gel Technique”. Defence Science Journal 46, no. 2 (January 1, 2013): 105-107. Accessed April 20, 2024. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/4056.