“…The need to discriminate between efficient DMUs becomes more significant when the number of DMUs is small relative to the total number of inputs and outputs. Some studies (Andersen & Petersen, 1993;Azizi & Ajirlu, 2010;Bal, Orkcu, & Celebioglu, 2008;Doyle & Green, 1994;Lam, 2010;Li & Reeves, 1999;Sexton, Silkman, & Hogan, 1986;Tofallis, 1997) propose different approaches to enhance discrimination in DEA. Among those studies, Sexton et al (1986) and Doyle and Green (1994) suggest using the cross-efficiency matrix to measure efficiencies of DMUs.…”