Use of Sulfuric Acid-Impregnated Biochar Catalyst in Making of Biodiesel From Waste Cooking Oil Via Leaching Method von Sofyan, Muhammad Ihsan, Mailani, Putri Julpa, Setyawati, Avi Waras, Sulistia, Susi, Suciati, Fuzi, Hauli, Latifah, Putri, Reza Audina, Ndruru, Sun Theo C. L., Mawarni, Rista Siti, Meliana, Yenny, Nurhayati, Nurhayati, Joelianingsih, Joelianingsih

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