Seiford LM and J Zhu (1998). “On Piecewise Loglinear Frontiers and Log Efficiency Measures.” Computer and Operations Research 25(5): 389-395.
Seiford LM and J Zhu (1998). “On Piecewise Loglinear Frontiers and Log Efficiency Measures.” Computer and Operations Research 25(5): 389-395.