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
"Aronszajn, Nachman",On a problem of Hermann Weyl in the theory of singular : sturm Liouville equations,,"University of Kansas, Department of Mathematics",1956,Studies in eigenvalue problems : Technical report,,,,https://cir.nii.ac.jp/crid/1130000794130966400