Tulkens H and P Vanden Eeckaut (1995). “Non-Frontier Measures of Efficiency, Progress and Regress for Time Series Data.” Int J Prod Econ 39(1-2): 83-97.

Tulkens H and P Vanden Eeckaut (1995). “Non-Frontier Measures of Efficiency, Progress and Regress for Time Series Data.” Int J Prod Econ 39(1-2): 83-97.

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