https://www.corporatebenchmark.org/sites/default/files/2019-11/CHRB2019KeyFindingsReport.pdf
http://ec.europa.eu/transport/sites/transport/files/pocketbook2016.pdf
https://papers.ssrn.com/sol3/Delivery.cfm/SSRN_ID4092831_code1752653.pdf?abstractid=4092831&mirid=1