USMAN, Fahrul; TINUNGKI, Georgina Maria; HERDIANI, Erna Tri. Model Semivariogram dalam Menaksir Sebaran Kadar Ni Menggunakan Metode Ordinary Kriging (Studi Kasus Endapan Nikel Laterit di PT Vale Indonesia Tbk). SPECTA Journal of Technology, [S. l.], v. 6, n. 1, p. 55–67, 2022. DOI: 10.35718/specta.v6i1.697. Disponível em: https://journal.itk.ac.id/index.php/sjt/article/view/697. Acesso em: 2 jul. 2025.