著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL
"Stefánsson, Jón R.",On a problem of J. Dixmier concerning ideals in a von Neumann algebra,,"Aarhus universitet, Matematisk institut",1969,Preprint series,,,,https://cir.nii.ac.jp/crid/1130013316607899794