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
"Iohvidov, I. S. and Krein, M. G. and Langer, H.",Introduction to the spectral theory of operators in spaces with an indefinite metric,,Akademie-Verlag,1982,Mathematical research = Mathematische Forschung,,,,https://cir.nii.ac.jp/crid/1130282272036046464