Leon Trotsky | León | Kings of Leon | Nuevo León | Leon Russell | León, Guanajuato | Jean-Léon Gérôme | Kingdom of León | Christian Lindberg | Leon | Saint-Pol-de-Léon | Leon René | Leon Lai | Léon Blum | Leon Redbone | León, Nicaragua | Angelu de Leon | Province of León | Magnus Lindberg | Leon County, Florida | Leon Battista Alberti | León, Spain | Leon Panetta | Kings Of Leon | Juan Ponce de León | André Leon Talley | Oscar D'León | Leon Ware | Leon Morris | León Gieco |
One of the most influential theories of European integration is Neo-functionalism, developed by Ernst B. Haas (1958) and further investigated by Leon Lindberg (1963).