著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Robert P. Geroch,Topology in General Relativity,Journal of Mathematical Physics,0022-2488,AIP Publishing,1967-04-01,8,4,782-786,https://cir.nii.ac.jp/crid/1360861713231977088,https://doi.org/10.1063/1.1705276