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Cooper WW and K Tone (1997). “Measures of Inefficiency in Data Enveloping Analysis and Stochastic Frontier Estimation.” EJOR 99(1): 72-88.

Cooper WW, P Kyung Sam and Y Gang (1999). “IDEA and AR-IDEA: Models for Dealing with Imprecise Data in DEA.” Management Science 45(4): 597-607.

Cooper WW and K Tone (1997). “Measures of Inefficiency in Data Envelopment Analysis and Stochastic Frontier Estimation.” EJOR 99: 72-88.

Cooper WW, P Kyung Sam and Y Gang (2001). “An Illustrative Application of Idea (Imprecise Data Envelopment Analysis) to a Korean Mobile Telecommunication Company.” Operations Research 49(6): 807-820.

Cooper WW, K Tone, H Takamori and T Sueyoshi (1994). “Data Envelopment Analysis: Survey and Interpretations-Part I.” Operations Research: Communications of Operations Research Society of Japan 39(8): 419-425.

Cooper WW, S Li, LM Seiford, K Tone, RM Thrall and J Zhu (2001). “Sensitivity and Stability Analysis in DEA: Some Recent Developments.” JPA 15(3): 217-246.

Cornwell C (1998). “Estimating Radial Measures of Productivity Growth: Frontier vs. Non-Frontier Approaches.” JPA 10(1): 35-46.

Cooper WW, DKS Park and P Ciurana (2000). “Marginal Rates and Elasticities of Substitution with Additive Models in DEA.” JPA 13(2): 105-123.

Cooper WW, KS Park and JT Pastor (1999). “Ram: A Range Adjusted Measure of Inefficiency for Use with Additive Models, and Relations to Other Models and Measures in DEA.” JPA 11(1): 5-42.