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“KLASIFIKASI SUMBERDAYA ENDAPAN NIKEL LATERIT DAERAH PULAU OBI, HALMAHERA SELATAN DENGAN PENDEKATAN RELATIVE KRIGING STANDARD DEVIATION (RKSD): Fakultas Teknik Universitas Muhammadiyah Maluku Utara Ternate”, EJD, vol. 10, no. 1, pp. 71–79, Mar. 2017, Accessed: Nov. 12, 2025. [Online]. Available: https://jurnal.ummu.ac.id/index.php/dintek/article/view/46