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		Adiani, K., 		Gunadnya, I., & 		Setiyo, Y.
(2019).
 Pengaruh Penambahan Urea pada Mediad dan Pemanasan terhadap Produksi Biogas.
<em>Jurnal BETA (Biosistem Dan Teknik Pertanian), 8</em>(1), 86-92.
doi:10.24843/JBETA.2020.v08.i01.p11