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) Roger Ware,Endomorphism Rings of Projective Modules,Transactions of the American Mathematical Society,0002-9947,JSTOR,1971-03,155,1,233,https://cir.nii.ac.jp/crid/1362544420278566912,https://doi.org/10.2307/1995475