Cahyadi, Mokhamad Nur, Anak Agung Adhi Dermawan, and Buldan Muslim. “STUDI PERUBAHAN IONOSFER AKIBAT LETUSAN GUNUNG BERAPI DENGAN PENGAMATAN TOTAL ELECTRON CONTENT GNSS”. GEOID 13, no. 2 (February 1, 2018): 196–199. Accessed August 6, 2025. https://journal.its.ac.id/index.php/geoid/article/view/1575.