1. The European green deal,2019
2. An energy sector roadmap to carbon neutrality in China,2021
3. C2ES – Center for Climate and Energy Solutions. Global Emissions. Https://WwwC2esOrg/Content/International-Emissions/2022.[.
4. A critical review of biogas production and usage with legislations framework across the globe;Abanades;Int J Environ Sci Technol,2021
5. A biometán előállítása és betáplálása a földgázhálózatba;Kovács,2011