http://cep.lse.ac.uk/pubs/download/special/cepsp34.pdf
https://www.nber.org/system/files/working_papers/w23583/w23583.pdf
https://www.esri.ie/system/files/publications/RS152.pdf
https://www.bwb.gv.at/fileadmin/user_upload/Abschlussbericht_BU_Kraftstoffe_2022_final_barrierefrei.pdf