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https://backend.orbit.dtu.dk/ws/files/142941167/GMSARN2017_E_30.pdf
https://www.bangkokpost.com/business/2261847/whats-behind-the-oil-price-hike-
https://nac.today/en/a/1148767
https://phys.org/news/2016-08-thai-village-poop-power-homes.html
https://peacefulsocieties.uncg.edu/2016/08/18/cow-poop-powers-thai-stoves/
https://www.energy.gov.za/files/biogas/presentations/2013-NBC/Biogas-in-India.pdf