Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
R. B. Warfield,Exchange rings and decompositions of modules,Mathematische Annalen,0025-5831,Springer Science and Business Media LLC,1972-03,199,1,31-36,https://cir.nii.ac.jp/crid/1363388845662843136,https://doi.org/10.1007/bf01419573