Roll Y, D Serroussy and B Golany (1989). “Measuring the Efficiency of Maintenance Units in the Israeli Air-Force.” EJOR 43(2): 136-142.

Riddington G and J Cowie (1994). “Performance Assessment Using DEA: A Cautionary Note.” JORS 45(5): 603-604.

Riddington G and J Cowie (1994). “Viewpoints: Performance Assessment Using DEA – a Cautionary Note.” JORS 45(5): 603-604.

Rilstone P (1992). “Semiparametric-Iv Estimation with Parameter Dependent Instruments.” Econometric Theory 8(3): 403-406.

Ritchie PC and JE Rowcroft (1996). “Choice of Metric in the Measurement of Relative Productivity Efficiency.” Int J Prod Econ 46-47: 433-439.

Ritter C and L Simar (1997). “Pitfalls of Normal-Gamma Stochastic Frontier Models.” JPA 8(2): 167-182.

Robinson PM (1991). “Automatic Frequency-Domain Inference on Semiparametric and Nonparametric Models.” Econometrica 5: 1329-1363.

Revilla E, J Sarkis and A Modrego (2003). “Evaluating Performance of Public-Private Research Collaborations: A DEA Analysis.” JORS 54(2): 165-174.

Reynolds D (2004). “An Exploratory Investigation of Multiunit Restaurant Productivity Assessment Using Data Envelopment Analysis.” J Travel and Tourism Marketing 16(2/3): 19-26.

Rezitis AN (2006). ” Productivity Growth in the Greek Banking Industry: A Non-Parametric Approach.” J Appl Econ 9(1): 119-138.