Model Semivariogram dalam Menaksir Sebaran Kadar Ni Menggunakan Metode Ordinary Kriging (Studi Kasus Endapan Nikel Laterit di PT Vale Indonesia Tbk). sjt [Internet]. 25 April 2022 [dikutip 2 November 2026];6(1):55-67. Tersedia pada: https://journal.itk.ac.id/index.php/sjt/article/view/697