https://www.osw.waw.pl/sites/default/files/OSW-Report_The-middle-corridor_net.pdf
http://www.case-research.eu/files/?id_plik=5223
http://www.amchameu.eu/sites/default/files/publications/files/transatlanticeconomy2021_fullreporthr.pdf
https://ec.europa.eu/agriculture/sites/agriculture/files/external-studies/2016-bilateral-trade-agreements/exec-sum_en.pdf