https://www.cbi.org.uk/media/4112/the-red-tape-challenge-final.pdf
http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf
https://repository.uneca.org/ds2/stream/?#/documents/c4d5119f-1374-435d-900a-4e6e683a1b41/page/1