Fatkur Rhohman and Hesti Istiqlaliyah 2021. Analysis of Biogas Production From Fermentation Results of Pineapple Bark Waste as Main Raw Material: Analisa Produksi Biogas Dari Hasil Fermentasi Limbah Kulit Nanas Sebagai Bahan Baku Utama. Procedia of Engineering and Life Science. 1, 1 (Apr. 2021). DOI:https://doi.org/10.21070/pels.v1i1.860.