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
"Fleige, Andreas",Spectral theory of indefinite Krein-Feller differential operators,,Akademie Verlag,1996,Mathematical research = Mathematische Forschung,,3055017420,,https://cir.nii.ac.jp/crid/1130000794493336704