@book{justhis5591,
           title = {Trait{\'e} pratique de la Nationalit{\'e} belge},
          author = {C.L. Closset},
         address = {Bruxelles},
       publisher = {Bruylant},
            year = {1970},
             url = {http://www.just-his.be/eprints/5591/}
}