Qian, H., G. Han, H. Yang, G. Lin, and R. Xu. “Investigation on Magnetic Properties of Hematite Superstructures With Controlled Microstructures”. ASEAN Journal of Chemical Engineering, Vol. 8, no. 1, Dec. 2008, pp. 51-60, https://jurnal.ugm.ac.id/v3/AJChE/article/view/7700.