1Barro Robert J,Xavier Sala-I-Martin.Economic Growth[]..1995
2Knack Stephen,Keefer Philip.Institutions and Economic Performance: Cross-Country Tests Using Alternative Institutional Measures[].Economics and Politics.1995
3North Douglass,Robert P Thomas.The Rise of Western World: A New Economic History[]..1973
4Hall Robert E,Charles Jones.Why do some countries produce so much more output per worker than others?[].Quarterly Journal.1999