H. Shahin, 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)”, Tuj-bio, vol. 39, no. 3, Sep. 2018.