@techreport{monitoring2006proportion,
  title = {Proportion of impermeable surfaces}
  author = {Monitoring des Quartiers},
  url = {https://monitoringdesquartiers.brussels/maps/statistiques-environnement-bruxelles/espaces-verts-region-bruxelloise/part-des-surfaces-impermeables/0/2006/#},
  year = {2006}
}