Yang Y-S (1998). “Data Envelopment Analysis (DEA) Model with Interval Gray Numbers.” Int J Information and Management Sciences 9(4): 11-23.

Yang Z and JC Paradi (2004). ?DEA Evaluation of a Y2k Software Retrofit Program.” IEEE Transactions on Engineering Management 51(3): 279-287.

Yan-Kwang C and L Hung-Chang (2004). “Multi-Criteria Design of an X&Macr; Control Chart.” Computers and Industrial Engineering 46(4): 877-891.

Yao C (2004). “Ranking Efficient Units in DEA.” Omega 32(3): 213-219.

Yao C and AI Ali (2002). “Output-Input Ratio Analysis and DEA Frontier.” EJOR 142(3): 476-479.

Yao C, L Liang and Y Feng (2006). “A DEA Game Model Approach to Supply Chain Efficiency.” Ann Oper Res 145(1): 5.

Yao C, H Morita and J Zhu (2003). “Multiplier Bounds in DEA Via Strong Complementary Slackness Condition Solution.” Int J Prod Econ 86(1): 11-19.

Yatchew A (2000). “Scale Economies in Electricity Distribution: A Semiparametric Analysis.” J Applied Econometrics 15(2): 187-210.

Yang C and W-M Lu (2006). “Assessing the Performance and Finding the Benchmarks of the Electricity Distribution Districts of Taiwan Power Company.” IEEE Transactions on Power Systems 21(2): 853-861.

Yang C and WM Lu (2006). “A Macro Analysis of Taiwan’s International Tourist Hotel Industry by Using the Sliding Window Method.” J Oper Res Soc JPN 49(3): 238-255.