@book{justhis2080,
           title = {Le Bulletin l{\'e}gislatif belge. Recueil bimensuel contenant des lois, arr{\^e}t{\'e}s royaux, trait{\'e}s, conventions, arr{\^e}t{\'e}s et circulaires minist{\'e}riels d'int{\'e}r{\^e}t g{\'e}n{\'e}ral (etc.)},
         address = {Bruxelles},
       publisher = {Larcier},
            year = {1931},
        keywords = {r{\`e}glement reglement rule regulation verordening
law wet loi circulaire circular omzendbrief},
             url = {http://www.just-his.be/eprints/2080/}
}