Vega LC and A Veiderpass (1994). “Efficiency and Change in the Productivity of the Peruvian Cement Industry – Application of a Nonparametric Method.” Trimestre Economico 61(242): 309-333.

Vega LC and A Veiderpass (1994). “Efficiency and Change in the Productivity of the Peruvian Cement Industry – Application of a Nonparametric Method.” Trimestre Economico 61(242): 309-333.

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