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
"Hesse, Martin",Harmonic maps into trees and graphs : analytical and numerical aspects,,Rheinische Friedrich-Wilhelms-Universität,2005,Bonner mathematische Schriften,,,,https://cir.nii.ac.jp/crid/1130282268698072448