@book{justhis2341,
           title = {Belgique. Cinquante ans de droit public (1869-1919)},
          author = {Paul Errera},
         address = {Paris},
       publisher = {Lahure},
            year = {1920},
        keywords = {public publique publiek law wet loi},
             url = {http://www.just-his.be/eprints/2341/}
}