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
"Onwunta, Akwum",Contributions to credit portfolio modeling and optimization,,P. Lang,2011,Schriften zur empirischen Wirtschaftsforschung,,9783631611715,,https://cir.nii.ac.jp/crid/1130000797862404224