Sutrisno, Agung Dwi. “PREDIKSI KEDALAMAN BATUBARA MENGGUNAKAN TRIANGGULASI DAN KRIGING”. KURVATEK 2, no. 1 (January 15, 2018): 85–89. Accessed June 5, 2026. https://journal.itny.ac.id/index.php/krvtk/article/view/249.