Tutun Nugraha, Yestine Yuliantina, and Supandi Suminta. 2011. “ACTIVATION AND PURIFICATION OF BENTONITE FOR THE TREATMENT OF CRUDE PALM OILAS VEGETABLE OIL”. Jurnal Sains Materi Indonesia 12 (2):91-95. https://doi.org/10.17146/jsmi.2011.12.2.4596.