?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Vael%2C+Claude&rft.aulast=Vael&rft.aufirst=Claude&rft.date=2005&rft.isbn=90-5201-937-1&rft.title=Cadre+juridique+pour+l'exploitation+du+gaz+en+Belgique+avant+1873&rft.btitle=L'industrie+du+gaz+en+Europe+(XIXe-XXe+si%C3%A8cle).+L'innovation+entre+march%C3%A9s+priv%C3%A9s+et+collectivit%C3%A9s+publiques&rft.genre=bookitem