Text ( visual ) : unmediated Hyperbolic geometry from a local viewpoint / Linda Keen, Nikola Lakic. -- : hardback ; : pbk. -- Cambridge, UK : Cambridge University Press , 2007. -- x, 271 p. : ill. ; 24 cm. -- (London Mathematical Society student texts ; 68). -- Includes bibliographical references (p. 264-267) and index. -- ISBN 9780521863605 ; 9780521682244 ; (BA80992048) ; https://ci.nii.ac.jp/ncid/BA80992048 Author Heading(s): Keen, Linda ; Lakic, Nikola. -- Classification(s): LCC : QA685 ; DC22 : 516.9. -- Subject Heading(s): LCSH : Geometry, Hyperbolic