Forrsund FR and L Hjalmarsson (1990). “Deterministic Parametric and Nonparametric Estimation of Efficiency in Service Production.” J Econometrics 46: 213-227.

Forrsund FR and L Hjalmarsson (1990). “Deterministic Parametric and Nonparametric Estimation of Efficiency in Service Production.” J Econometrics 46: 213-227.

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