5Thomas V. Yan Wang, Xibo Fan. Measuring education inequality: Gini coefficients of education[J]. The World bank Institute, Sep 27, 1999, Washington D. C.
6Becker G S. Human capital: A theoretical and empirical analysis with special referenceto education[M]. Second Edition, New Ynrk. National Bureau of Economic Research,1975.
7Gregorio J D , Lee J W. Ducation and income distribution: New evidence from crosscountry data[J]. Review of Income and Wealth, 2002,(48):395-416.
8Mincer Schooling. Experience and earnings[M]. Cambridge, National Bureau of Economic Research, 1974.
9Schultz T W. Capital formation by educatinn[J]. Journal of Political Economy, 1960,68(12) :571-583.
10Bedrmam Jere, BirdsalI, Nancy. The qulity of schooling, quantity alone is misleading[J]. American Econominc Review, vol. 73, 1983, (5) : 928-946.