
https://ecipe.org/wp-content/uploads/2021/12/ECI_21_PolicyBrief_16_2021_LY03.pdf

https://www.bwb.gv.at/fileadmin/user_upload/Abschlussbericht_BU_Kraftstoffe_2022_final_barrierefrei.pdf

http://www.iata.org/whatwedo/Documents/economics/impact_of_brexit.pdf