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
"Friedman, Joel and Dicks, Warren","Sheaves on graphs, their homological invariants, and a proof of the Hanna Neumann conjecture",,American Mathematical Society,2015,Memoirs of the American Mathematical Society,,9781470409883,,https://cir.nii.ac.jp/crid/1130000793766315904