Srigutomo, Wahyu, Asep Harja, Doddy Sutarno, and Tsuneomi Kagiyama. 2016. “VLF Data Analysis Through Transformation Into Resistivity Value: Application TTo Synthetic and Field Data”. Indonesian Journal of Physics 16 (4), 126-36. https://ijphysics.fi.itb.ac.id/index.php/ijp/article/view/132.