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.