Thompson RG, PS Dharmapala and RM Thrall (1995). “Linked-Cone DEA Profit Ratios and Technical Efficiency with Application to Illinois Coal Mines.” Int J Prod Econ 39(1-2): 99-115.

Thompson RG, PS Dharmapala and RM Thrall (1995). “Linked-Cone DEA Profit Ratios and Technical Efficiency with Application to Illinois Coal Mines.” Int J Prod Econ 39(1-2): 99-115.

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