F?re R, S Grosskopf and CAK Lovell (1988). “The Effect of Unions on Productivity: U.S. Surface Mining of Coal.” Management Science 34(9): 1037-1053.

F?re R, S Grosskopf and CAK Lovell (1988). “An Indirect Approach to the Evaluation of Producer Performance.” J Public Economics 37: 71-89.

F?re R, S Grosskopf and CAK Lovell (1988). “Scale Elasticity and Scale Efficiency.” J Institutional and Theoretical Economics 14: 721-729.

F?re R, S Grosskopf and R Br?nnlund (1996). Intertemporal Production Frontiers: With Dynamic DEA. London, UK, Kluwer.

F?re R, S Grosskopf and F Hernandez-Sancho (2004). “Environmental Performance: An Index Number Approach.” Resource and Energy Economics 26(4): 343-352.

F?re R, S Grosskopf and S Kraft (1987). “Technical Efficiency and Size: the Case of Illinois Grain Farms.” European Review of Agricultural Economic 14(4): 367-381.

F?re R and S Grosskopf (1994). “Measuring Productivity – a Comment.” Int J Oper Prod Man 1: 83-88.

F?re R, S Grosskopf and WF Lee (1995). “Productivity in Taiwanese Manufacturing-Industries.” Appl Econ 2: 259-265.

F?re R and S Grosskopf (1995). “Nonparametric-Tests of Regularity, Farrell Efficiency, and Goodness- of-Fit.” J Econometrics 6: 415-425.

F?re R, S Grosskopf, B Lindgren and P Roos (1992). “Productivity Changes in Swedish Pharmacies 1980-1989: A Non-Parametric Malmquist Approach.” JPA 3: 85-101.