Shahin, H., G. Shehada, W. Ali, S. Haifa, and R. alkubaily. “The Effect of Applying Sewage Sludge on Chromium and Copper Accumulation in Soil and Eucalyptus Camaldulensis in Fedio Plantation (Lattakia)”. Tishreen University Journal -Biological Sciences Series, vol. 39, no. 3, Sept. 2018, https://journal.tishreen.edu.sy/index.php/bioscnc/article/view/3893.