“REMOVAL OF COPPER IONS FROM WASTE WATER BY ADSORPTION WITH MODIFIED AND UNMODIFIED SUNFLOWER STALKS”. Journal of Engineering 16, no. 03 (September 1, 2010): 5411–5421. Accessed April 25, 2025. https://www.joe.uobaghdad.edu.iq/index.php/main/article/view/2649.