6Charnes Abraham, William Wager Cooper, Susan X Li. Using data envelopment analysis to evaluate efficiency in the economic performance of Chinese cities. Socio-Eeonomic Planning Sciences, 1989, (23) :325-344.
7Hawdon D. Efficiency, performance and regulation of the international gas industry:A bootstrap DEA approaches. Energy Policy, 2003, 31(11) : 1167-1178.
8Fare R, Grosskopf S, Linderdgren B, et al. Productivity changes in Swedish pharmacies 1980--1989: A nonpara metric Malmquist approach. Journal of Productivity Analysis, 1992, (3) : 85-101.
9Fare R, Grosskopf S, Norris M, et al. Productivity growth, technical progress, and efficiency change in industri alized countries. American Economic Review, 1994, 84(1) : 66-83.
