Tulkens H and P Vanden Eeckaut (1995). “Non-Parametric Efficiency, Progress and Regress Measures for Panel Data: Methodological Aspects.” EJOR 80(3): 474-499.

Tulkens H and P Vanden Eeckaut (1995). “Non-Parametric Efficiency, Progress and Regress Measures for Panel Data: Methodological Aspects.” EJOR 80(3): 474-499.

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