Cristache SE (2005). “Estimation of Company Cost Functions by DEA.” Economic Computation and Economic Cybernetics Studies and Research 39(1-4): 107-112.

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.

Cooper WW, KS Park and G Yu (2001). “Idea (Imprecise Data Envelopment Analysis) with CMDS (Column Maximum Decision Making Units).” JORS 52(2): 176-181.

Cooper WW, LM Seifor and K Tone (1999). A Comprehensive Text with Models, Applications, References and DEA-Solver Software. Boston, USA, Kluwer.

Cooper WW, LM Seiford, E Thanassoulis and SH Zanakis (2004). ?DEA and its Uses in Different Countries.” EJOR 154(2): 337-344.

Cooper WW, LM Seiford and K Tone (2005). Introduction to Data Envelopment Analysis and its Uses: With DEA-Solver Software and References, Springer.

Cooper WW, LM Seiford and J Zhu (2004). Handbook on Data Envelopment Analysis, Kluwer Academic.