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
"Fenchel, W. (Werner) and Nielsen, Jakob and Schmidt, Asmus L.",Discontinuous groups of isometries in the hyperbolic plane,,W. de Gruyter,2003,De Gruyter studies in mathematics,,3110175266,,https://cir.nii.ac.jp/crid/1130282269353692032