Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TAKEDA Akiko and NISHINO Hisakazu,On Measuring the Inefficiency of DMU with Inner-Product Norm in DEA,日本オペレーションズ・リサーチ学会秋季研究発表会アブストラクト集,,The Operations Research Society of Japan,1998-10-15,1998,,10-11,https://cir.nii.ac.jp/crid/1571980077348510720,