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
"Kauffman, Robert McKenzie and Read, Thomas Thornton and Zettl, Anton",The deficiency index problem for powers of ordinary differential expressions,,Springer-Verlag,1977,Lecture notes in mathematics,,"3540085238,0387085238",,https://cir.nii.ac.jp/crid/1130000797426109952