Bjurek H, L Hjalmmarsson and FR Forsund (1990). “Deterministic Parametric and Nonparametric Estimation of Efficiency in Service Production: A Comparison.” J Econometrics 4: 213-227.
Bjurek H, L Hjalmmarsson and FR Forsund (1990). “Deterministic Parametric and Nonparametric Estimation of Efficiency in Service Production: A Comparison.” J Econometrics 4: 213-227.