@book{justhis6267,
           title = {Guide pratique de l'expert. Trait{\'e} d'expertise en toute mati{\`e}re, 3e {\'e}d.},
          author = {J. 's Heeren},
         address = {Tirlemont},
       publisher = {'s Heeren},
            year = {1902},
             url = {http://www.just-his.be/eprints/6267/}
}