Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Coornaert, M. and Delzant, T. and Papadopoulos, Athanase",Géométrie et théorie des groupes : les groupes hyperboliques de Gromov,,Springer-Verlag,1990,Lecture notes in mathematics,,"3540529772,0387529772",,https://cir.nii.ac.jp/crid/1130000793997703168