“Removal of Toxic Metals Contaminated Soil Using Different Amendments and Sunflower Species (Helianthus Annuus)”. Global Journal of Science Frontier Research 16, no. 13 (May 2, 2016): 37–39. Accessed November 1, 2026. https://www.journalofscience.org/index.php/GJSFR/article/view/.