Syeda Hijab Zehra, et al. “Appraisement and Categorization of Compostable and Non-Compostable Plastic Bags Using HHXRF Spectrophotometer, A Study on Brands in Islamabad”. NUST Journal of Natural Sciences, vol. 9, no. 3, Sept. 2024, pp. 49-62, doi:10.53992/njns.v9i3.196.