6Kevin Honglin, ZHANG, Shunfeng, SONG. "Rural-urban Migration and Urbanization in China.. Evidence from Time-series and Cross-section Analyses". China Economic Review, 2003, 14 (4) : 386--400.
7Au, Chun-Chung and J. Vernon Henderson. "Are Chinese Cities Too Small?". Review of Economic Stud- ies, 2006, 73 (3): 549--576.
8Charnes, A. , Cooper, W.W. , and E. Rhodes. "Measuring the Efficiency of Decision Making Units". Eu- ropean Journal of Operational Research, 1978, 2 (6) : 429--444.
9Banker, R.D. , Charnes, A. , W.W. Cooper. "Some Models for Estimating Technical and Scale Efficien cies in Data Envelopment Analysis". Management Science, 1984, 30 (9).
