Charnes A, WW Cooper, QL Qei and ZM Huang (1989). “Cone Ratio Data Envelopment Analysis and Multi-Objective Programming.” Int J Syst Sci 20(7): 1099-1118.
Charnes A, WW Cooper, QL Qei and ZM Huang (1989). “Cone Ratio Data Envelopment Analysis and Multi-Objective Programming.” Int J Syst Sci 20(7): 1099-1118.