1. Allen E. 2017. “What is the Treaty of Rome”. The Telegraph, 24 March, 2017. <https://www.telegraph.co.uk/news/0/treaty-rome/> (2018-10-16).
2. Anger N. Zannier L. 2017. “A new era of EU energy policy? Delivering on the Energy Union by National Plans”. Center of European Policy Study – Commentary, 6 June, 2017. <https://www.ceps.eu/publications/new-era-eu-energy-policy-deliveringenergy-union-national-plans> (2018-10-19).
3. Aoun M. 2015. “European Energy Security Challenges and Global Energy Trends: Old Wine in New Bottles?”. Istituto Affari Internazionali (IAI), IAI Working Papers 15, 03 January, 2015. <http://www.iai.it/sites/default/files/iaiwp1503.pdf> (2018-10-19).
4. Appleyard D. 2015. “Power plant filtration technology to achieve environmental performance”. Power Engineering International, 21 October, 2015. <https://www.powerengineeringint.com/articles/print/volume-23/issue-10/features/filteringout-power-plant-emissions.html> (2018-10-10).
5. Artic Council – Expert Group on Black carbon and Methane, 2017. “Summary of progress and recommendations 2017”.