Comment on “Using multi-level frontiers in DEA models to grade countries/territories” by G.-l. Yang et al. [Journal of Informetrics 10(1) (2016), 238–253]
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论文评审过程：Available online 7 June 2017, Version of Record 7 June 2017.
论文官网地址：https://doi.org/10.1016/j.joi.2017.05.011
