S. T. Gebreyesus, “Heavy Metals in Contaminated Soil: Sources & Washing through Chemical Extractants”, ASRJETS-Journal, vol. 10, no. 1, pp. 54–60, Sep. 2014, Accessed: Jan. 10, 2026. [Online]. Available: https://asrjetsjournal.org/American_Scientific_Journal/article/view/730