“Energy Band Gap under the Effect of Temperature in Lead Sulfide (PbS)”. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, DOI: 10.31695/IJASRE 5, no. 6 (June 5, 2019): 75–78. Accessed April 30, 2024. https://ijasre.net/index.php/ijasre/article/view/323.