“…The literature on the DEA method is significantly larger. Some leading studies include Bell and Morey (1995), Morey and Dittman (1995), Brown and Ragsdale (2002), Hwang and Chang (2003), Reynolds (2003), Barros and Alves (2004), Sigala et al (2004), Barros (2005), Chiang et al (2004), Barros and Mascarenhas (2005), Wang et al (2006a,b), Reynolds and Thomson (2007), Yu and Lee (2009), Barros and Dieke (2008) and Barros et al (2009). However, there are fewer papers in the existing body of literature that used the SF method.…”