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
"Chalopin, Jérémie and Chepoi, Victor and Hirai, Hiroshi and Osajda, Damian",Weakly modular graphs and nonpositive curvature,,American Mathematical Society,2020,Memoirs of the American Mathematical Society,,9781470443627,,https://cir.nii.ac.jp/crid/1130851695086700940