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

https://theconversation.com/solo-el-11-5-de-la-economia-de-la-union-europea-es-circular-como-aumentar-el-porcentaje-223372

https://www.esri.ie/system/files/publications/RS179.pdf