@book{ BA06817571,
 author = "Sengupta, Jati Kumar",
 title = "Efficiency analysis by production frontiers : the nonparametric approach",
 publisher = "Kluwer Academic Publishers",
 year = "1989",
 series = "Theory and decision library",
 number = "ser. B . Mathematical and statistical methods",
 URL = "https://ci.nii.ac.jp/ncid/BA06817571"
}
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