6A Charnes, W W Cooper, E Rhodes. Measuring the efficiency of decision making units[J]. European Journal Operational Research, 1978, (2) : 429 - 444.
7A Charnes, W W Cooper, B Golany, L Seiford, J Stutz.Foundations of data envelopment analysis for pareto-Koopmans efficient empirical production[ J]. Journal of Econometrics(Netherland), 1985, 30(1-2): 91- 107.
8Xielin Liu, Steven White. An exploration into regional variation in innovation activity in china[J]. International Journal of Technology Management, 2001, 21 (1-2): 114-129.