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Biogas Technology in South Africa, Problems, Challenges and Solutions. International Journal of Sustainable Energy and Environmental Research, [S. l.], v. 5, n. 4, p. 58–69, 2016. DOI: 10.18488/journal.13/2016.5.4/13.4.58.69. Disponível em: https://archive.conscientiabeam.com/index.php/13/article/view/2115. Acesso em: 14 sep. 2026.