
https://www.politico.eu/article/gert-jan-koopman-top-eu-official-helps-run-a-luxury-hotel-in-bali-and-never-had-to-tell-brussels/

https://www.socialeurope.eu/breaking-the-chains-subcontracting-in-the-eu

http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32014L0065&from=EN