Studi pengaruh waktu proses terhadap proses reduksi langsung bijih besi bongkah menggunakan rotary kiln sederhana skala industri rumah tangga = Study of reduction time effect on direct reduction of lateritic iron ore using mini rotary kiln in home industry scope / Esaputra Mangarul Rajagukguk - Rajagukguk, Esaputra Mangarul, author (Fakultas Teknik Universitas Indonesia, 2014)