https://chemsec.org/open-letter-to-the-commission-regarding-transparency/
https://www.socialeurope.eu/leaving-the-energy-charter-treaty-its-not-so-easy
http://www.case-research.eu/files/?id_plik=5223
https://papers.ssrn.com/sol3/Delivery.cfm/SSRN_ID3950757_code410506.pdf?abstractid=3909166&mirid=1