著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) S. N. Afriat,Orthogonal and oblique projectors and the characteristics of pairs of vector spaces,Mathematical Proceedings of the Cambridge Philosophical Society,0305-0041,Cambridge University Press (CUP),1957-10,53,4,800-816,https://cir.nii.ac.jp/crid/1364233270493441664,https://doi.org/10.1017/s0305004100032916