“NICKEL IONS REMOVAL FROM AQUEOUS SOLUTIONS USING SAWDUST AS ADSORBENT: EQUILIBRIUM, KINETIC AND THERMODYNAMIC STUDIES”. Journal of Engineering and Sustainable Development, vol. 21, no. 3, May 2017, pp. 60-71, https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/533.