@book{justhis3087,
           title = {Code de l'air (Minist{\`e}re des Communications)},
         address = {Bruxelles},
       publisher = {Hayez},
            year = {1954},
        keywords = {biens publics openbaar domein public goods staat state {\'e}tat gestion management gestion communication communication communicatie },
             url = {http://www.just-his.be/eprints/3087/}
}