6Martinez - Bravo. M, G- P. Miquel, N. Qian and Y. Yao. Do Lo- cal Elections in Non - democracies Increase Accoutability? Evi- dence from Rural China[ Z ]. NBER workingpaper,2011.
7Grossman G.M. and A. B. Krueger. Economic Growth and the Environment [J]. Quarterly Journal of Economics, 1995 (2) : 353 - 377.
8Arellano M. and S. Bond. Some Tests of Specification for Panel Da- ta: Monte Carlo Evidence and an Application to Employment E- quations [J]. The Review of Economic Studies, 1991 (2) :277 - 297.
9Arellano M. and O. Borer. Another Look at The Instrumental Variable Estimation of Error - components Models [ J ]. Journal of Econometrics, 1995 (1):29-51.
10Blundell R. and S. Bond. Initial Conditions and Moment Re- strictions in Dynamic Panel- data Models [ J]. Journal of Econo- metrics, 1998 (2) :115 - 143.