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		Indra wiguna, I., 		Tirta Nindhia, T., & 		Surata, I.
2020 Jan  1.  Pemanfaatan Limbah Kotoran Gajah dan Grease dari Pengolahan Lumpur Tinja (PLT) Suwung Menjadi Biogas. Teknik Desain Mekanika. [Online] 9:1