8E.Wayne Nafziger,1990,"The Economics of Developing Countries"[M],Prentice Hall, Englewood, New Jersey, pp99-130.
9Angus Deaton, 1997, "The Analysis of Household Surveys. A Microeconomic Approach to Development Policy" [M]. Baltimore and London. Johns Hopkins University Press, PP139.
10Simon Kuzenets, 1995, "Economic Growth and Iincome Inequality" [J]. American Economic Review, Vol.45, No.l, Mar., PP1-28.