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.