Khanam, Z. ., I. . Riaz, . A. . Rasheed, and R. . Jalil. “Fabrication and Identification of Graphene Layers on Silicon Dioxide and Flexible PMMA Substrates: Graphene Fabrication”. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, vol. 53, no. 4, Apr. 2021, pp. 431-45, https://ppaspk.org/index.php/PPAS-A/article/view/253.