http://ec.europa.eu/transport/sites/transport/files/pocketbook2016.pdf
https://laffairedusiecle.net/wp-content/uploads/2021/02/20210203-Jugement-Affaire-du-Sie%CC%80cle.pdf
https://insightcrime.org/es/noticias/banqueros-criminales-latinoamerica-monopolio-colombia-gota-a-gota/
https://www.occrp.org/en/daily/11936-russian-ventilator-suppliers-may-be-conspiring-to-avoid-competition