Zafar, S., N. Khalid, M. Daud, and M. L. Mirza. “Kinetic Studies of the Adsorption of Thorium Ions onto Rice Husk from Aqueous Media: Linear and Nonlinear Approach”. The Nucleus, vol. 52, no. 1, Feb. 2015, pp. 14-19, http://thenucleuspak.org.pk/index.php/Nucleus/article/view/659.