Banker RD, WW Cooper, LM Seiford, RM Thrall and J Zhu (2004). “Returns to Scale in Different DEA Models.” EJOR 154(2): 345-362.
Banker RD, WW Cooper, LM Seiford, RM Thrall and J Zhu (2004). “Returns to Scale in Different DEA Models.” EJOR 154(2): 345-362.