Qian, Haisheng, Guchang Han, Hong Yang, Guofeng Lin, and Rong Xu. 2008. “Investigation on Magnetic Properties of Hematite Superstructures With Controlled Microstructures”. ASEAN Journal of Chemical Engineering 8 (1), 51-60. https://journal.ugm.ac.id/v3/AJChE/article/view/7700.