https://www.wartaekonomi.co.id/read224019/apa-itu-defisit-transaksi-berjalan.html
https://www.nqminerals.com/wp-content/uploads/2019/09/Nickel-report-v02-19-08-19.pdf
https://horizonteminerals.com/uk/en/nickel/
https://ekonomi.bisnis.com/read/20200228/257/1207243/kemenperin-industri-nikel-perlu-pendalaman
https://katadata.co.id/berita/2020/01/09/bkpm-larangan-ekspor-bijih-nikel-sesuai-uu-minerba
https://www.infopresiden.com/2020/06/indonesia-target-menjadi-pengekspor.html?m=1
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