Before revision: Other migration models Zipf's inverse distance law (1946) Gravity model and the friction of distance Stouffer's theory of intervening opportunities (1940) Lee's push-pull theory (1966) See also Berber people Ethnic cleansing Foreign worker Gastarbeiter Immigration policy Pied-noir Racial integration References Immigration to Spain: Implications for a Unified European Union Immigration Policy; Laura Huntoon; International Migration Review, Vol.
After revision: of migrationOther migration models Zipf's inverse distance law (1946) Gravity model and the friction of distance Stouffer's theory of intervening opportunities (1940) Lee's push-pull theory (1966) See also Berber people Ethnic cleansing Foreign worker Gastarbeiter Immigration policy Pied-noir Racial integration References Immigration to Spain: Implications for a Unified European Union Immigration Policy; Laura Huntoon; International Migration Review, Vol.