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 (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.

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