Sengupta JK (1995). “Estimating Efficiency by Cost Frontiers – a Comparison of Parametric and Nonparametric Methods. Appl Econ Letters.” Appl Econ Letters 284(2): 86-90.

Sengupta JK (1995). “Estimating Efficiency by Cost Frontiers – a Comparison of Parametric and Nonparametric Methods. Appl Econ Letters.” Appl Econ Letters 284(2): 86-90.

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