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
"Gray, Brayton",The HOPF invariant and related problems,,"Aarhus Universitet, Matematisk Institut",1970,Lecture notes series,,,,https://cir.nii.ac.jp/crid/1130282270775825280