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2. Billinton R, Allan RN (1996) Reliability evaluation of power systems, 2nd edn. Plenum Press
3. Bloomberg (2019) Why the world worries about Russia’s natural gas pipeline, 13 June 2019
4. Bloomberg New Energy Finance (2018a) New Energy Outlook 2018
5. Bloomberg New Energy Finance (2018b) The future of LNG, 4 May 2018