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Fitri, Mochammad Fadly (2022) Kewajiban Hukum Pengolahan dan Pemurnian Mineral Pasca Berlakunya UU No. 3 Tahun 2020 Tentang Pertambangan Mineral dan Batubara. (Legal Obligations of Mineral Processing and Refining After The Enactment of Law No. 3 of 2020 Concerning Mineral and Coal Mining). Doctoral thesis, Universitas 17 Agustus 1945 Surabaya.