Mohammed, Abdul-Halim A.K., et al. “The Effect of Crystallization Time and Acid Type on the Synthesis of Nano-Gamma Alumina Using Double Hydrothermal Method”. Iraqi Journal of Chemical and Petroleum Engineering, vol. 18, no. 2, June 2017, pp. 1-11, https://doi.org/10.31699/IJCPE.2017.2.1.