1. 1. Groblinghoff, S. (2019). The Future of the Energy Sector – Challenges and Opportunities. Bull or Bear? Outlook for natural gas demand in the Baltic region. Available at https://lg.lv/uploads/documents/2019-03-04_Presentation-Energetika-2019-Conference_-S.Groeblinghoff_LG_FINAL.pdf
2. 2. Krukowska, E. (2021). Europe Kicks the Can on Defining Role for Natural Gas in a Clean Energy Transition. Available at https://www.worldoil.com/news/2021/4/15/europe-kicks-the-can-on-defining-role-for-natural-gas-in-a-clean-energy-transition
3. 3. 2030 Climate Target Plan. (n.d.) Available at https://ec.europa.eu/clima/policies/eu-climate-action/2030_ctp_en
4. 4. Savickis, J., Zemite, L., Zeltins, N., Bode, I., & Jansons, L. (2020). The Natural Gas and Biomethane in the European Road Transport: The Latvian Perspective. Latvian Journal of Physics and Technical Sciences, 57 (3), 57–72. DOI: 10.2478/lpts-2020-0016
5. 5. Communication from the Commission to the European Parliament, the European Council, the Council, the European Economic and Social Committee and the Committee of the Regions. The European Green Deal. Available athttps://ec.europa.eu/info/sites/info/files/european-green-deal-communication-annex-roadmap_en.pdf