@techreport{paris2018paris,
  title = {Paris Region Key Figures 2018}
  author = {Paris Region Entreprises, Paris Ile-de-France Regional Chamber of Commerce and Industry, Paris Region Urban Planning and Development},
  url = {https://www.iau-idf.fr/fileadmin/NewEtudes/Etude_1437/KEY_FIGURES_2018-BD_version_definitive.pdf},
  year = {2018}
}