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Adrianto, Mario.
" Analisis Produksi Biogas Berdasarkan Bahan Baku Limbah Kotoran Sapi, Serbuk Gergaji, dan Effective Microorganisme-4 (EM4)." <em>Jurnal BETA (Biosistem dan Teknik Pertanian)</em> [Online], 7.2 (2019): 297-301. Web.  5 Sep. 2026