Yulianto, A., S. Bijaksana, and W. Loeksmanto. “Comparative Study on Magnetic Characterization of Iron Sand from Several Locations in Central Java”. Indonesian Journal of Physics, Vol. 14, no. 2, Nov. 2016, pp. 63-66, https://ijphysics.fi.itb.ac.id/index.php/ijp/article/view/80.