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 "Koshmanenko, V. D.",Singular quadratic forms in perturbation theory,,Kluwer,1999,Mathematics and its applications,,079235625X,,https://cir.nii.ac.jp/crid/1130000795286743296