https://www.diw.de/documents/publikationen/73/diw_01.c.670904.de/19-31-3.pdf
https://www.occrp.org/en/investigations/new-evidence-bolsters-allegations-adani-group-overcharged-for-coal
https://www.bruegel.org/wp-content/uploads/2022/04/PC-06-1.pdf
https://iea.blob.core.windows.net/assets/830fe099-5530-48f2-a7c1-11f35d510983/WorldEnergyOutlook2022.pdf