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.

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