Juliani, R., Sembiring, T., Sitepu, M., & Motlan, . (2015). Geophysical Study for Discovering The Missing of Lau Ketuken from The Surface at Sulkam Village. International Journal of Sciences: Basic and Applied Research (IJSBAR), 22(1), 360–366. Retrieved from https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/4020