Pengaruh penambahan reduktor sub - bituminous dan briket kokas kadar 10%,13%, 15%, 20% terhadap produk reaksi karbotermik bijih nikel saprolit = Effect of 10%, 13%, 15%, 20% briquette cokes and sub- bituminous reductor addition on the carbothermic reaction product of saprolite nickel ore ([Fakultas Teknik Universitas Indonesia, ], 2009)