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
"Kramer, Henry Paul and Wolf, Frantisek",Perturbation of differential operators,,"Dept. of Mathematics, University of California",1954,Technical report,,,,https://cir.nii.ac.jp/crid/1130282272342050304