[1] K. A. Rasheed, H. A. Flayyh, and A. T. Dawood, “Study the concentrations of Ni, Zn, Cd and Pb in the Tigris River in the city of Baghdad,” IJEAB, vol. 2, no. 1, pp. 196–201, 2017, doi: 10.22161/ijeab/2.1.24.