@unpublished{environnementbrussels2019reducing,
  title = {Reducing the environmental impact of existing buildings in the Brussels-Capital Region by 2030-2050}
  author = {Environnement.Brussels - Leefmilieu.Brussels},
  url = {https://environnement.brussels/sites/default/files/user_files/strategie_reno_fr.pdf},
  year = {2019}
}