
http://sprc.info/wp-content/uploads/2012/07/Polish-Migrants-in-London-extending-the-stay.pdf

https://www.socialeurope.eu/marrying-labour-flexibility-protection

https://www.etuc.org/fr/presse/rien-quen-2017-chaque-travailleur-subi-une-perte-de-salaire-de-1764-€-en-raison-de-la#.WqrAWUxuI2x