Tulkens H and P Vandeneeckaut (1995). “Nonparametric Efficiency, Progress and Regress Measures for Panel – Data – Methodological Aspects.” EJOR 8: 474-499.

Tulkens H and P Vandeneeckaut (1995). “Nonparametric Efficiency, Progress and Regress Measures for Panel – Data – Methodological Aspects.” EJOR 8: 474-499.

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