@book{justhis2622,
           title = {Code belge du constructeur civil},
          author = {J. 's Heeren},
         address = {Tienen},
       publisher = {'s Heeren},
            year = {1902},
        keywords = {construction	construction	bouw
law wet loi},
             url = {http://www.just-his.be/eprints/2622/}
}