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APA Citation
Ullah Khan, I., Hafiz Dzarfan Othman, M., Hashim, H., Matsuura, T., Ismail, A., Rezaei-DashtArzhandi, M., & Wan Azelee, I. (2017). biogas as a renewable energy fuel – A review of biogas upgrading, utilisation and storage. Energy conversion and management, 150, 277–294. http://access.bl.uk/ark:/81055/vdc_100053415456.0x000046