http://ec.europa.eu/transport/sites/transport/files/pocketbook2016.pdf
https://21stcenturywire.com/wp-content/uploads/2022/03/SenateReporten.pdf
https://data.consilium.europa.eu/doc/document/ST-14065-2022-INIT/en/pdf
https://www.hende-i-medio-ambiente.org/wp-content/uploads/2021/02/wpiea2020286-print-pdf.pdf