Wildani, Arin, Sukir Maryanto, and Adi Susilo. “Analisis Sinyal Seismik Tremor Harmonik Dan Tremor Spasmodik Gunungapi Semeru, Jawa Timur – Indonesia”. Wacana Didaktika 3, no. 2 (December 24, 2015): 140–150. Accessed January 25, 2026. http://journal.uim.ac.id/index.php/wacanadidaktika/article/view/33.