─ 20 ─Seiford, M. L.: Data Envelopment Analysis: Theory, Methodology and Applications, Kluwer Academic Publisher, Boston, MA, USA, （1994）.４）Cooper, W. W., Seiford, L. M., Tone, K.: Data Envelopment Analysis: A Comprehensive Text with Models, Applications, References, and DEA-Solver Software, Springer: Dordrecht, Netherlands, （1999）.５）日経リサーチ（編），第21回環境経営度調査報告書，（2018）.（R３.１.12受理）
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