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F?re R, S Grosskopf and CAK Lovell (1985). the Measurement of Efficiency of Production. Boston, USA, Kluwer-Nijhoff.

F?re R, S Grosskopf and CAK Lovell (1985). “Measuring Efficiency in Production: With an Application to Electric Utilities.” in F?re R, S Grosskopf and CAK Lovell (eds.) the Measurement of Efficiency of Production, Kluwer-Nijhoff: 185-214.

F?re R, S Grosskopf and CAK Lovell (1987). “Nonparametric Disposability Tests.” Zeitschrift Fur Nationalokonomie-J Economics 47(1): 77-85.

F?re R and S Grosskopf (2001). “When Can Slacks Be Used to Identify Congestion? An Answer to W.W. Cooper, L. Seiford and J. Zhu.” Socio-Econ Plan Sci 35(3): 217-221.

F?re R and S Grosskopf (2004). “Modeling Undesirable Factors in Efficiency Evaluation: Comment.” EJOR 157(1): 242-245.

F?re R and S Grosskopf (2006). “Resolving a Strange Case of Efficiency.” JORS 57(11): 1366-1368.

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.