Saputra, Andika S, Metallurgical Engineering Study Program, Department of Mining Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional “Veteran” Yogyakarta (Indonesia)
Saputro, Kristanto Jiwo, Mining Engineering Study Program, Department of Mining Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional “Veteran” Yogyakarta
Suharyadi, Heru, Universitas Pembangunan Nasional "Veteran" Yogyakarta (Indonesia)

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