Muhammad Aslam Baig, et al. “Analytical Techniques for Elemental Analysis: LIBS, LA-TOF-MS, EDX, PIXE, and XRF: A Review”. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, vol. 61, no. 2, June 2024, pp. 99-112, doi:10.53560/PPASA(61-2)676.