Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) BIRKENMEIER G. F.,Principally quasi Baer rings,Comm. Algebra,,,2001,29,2,639-660,https://cir.nii.ac.jp/crid/1571980074066962944,https://doi.org/10.1081/agb-100001530