1. Biogas: Developments and perspectives in Europe;Scarlat;Renew. Energy.,2018
2. Biogas in the United States: estimating future production and learning from international experiences;Murray;Mitig. Adapt. Strateg. Glob. Chang.,2017
3. World Bioenergy Association, Global Bioenergy Statistics 2020 WBA, (2020). https://www.worldbioenergy.org/uploads/201210 WBA GBS 2020.pdf (accessed June 10, 2021).
4. American Biogas Council, Championing the biogas industry, advancing a biogas future, (2017). https://americanbiogascouncil.org/ (accessed June 10, 2021).
5. A. Aebiom, A Biogas Road Map for Europe Content, (2010). https://www.big-east.eu/downloads/Brochure_BiogasRoadmap_WEB%5B1%5D.pdf (accessed June 10, 2021).