@book{justhis2054,
           title = {M{\'e}mento de l'environnement 92-93},
          author = {Alain Lebrun},
         address = {Anvers},
       publisher = {Kluwer},
            year = {1992},
        keywords = {law wet loi environnement    environment    milieu},
             url = {http://www.just-his.be/eprints/2054/}
}