Ryan, Patrick J. Euclidean and non-euclidean geometry : an analityc approach / Patrick J. Ryan. - 1a ed. - Cambridge : Cambridge university press, 1986 - xviii, 215 p. : íl. ; 23 cm. - International student edition . Incluye apéndice, referencias e índice ISBN: 0521256542 0521276357 Subjects--Topical Terms: Geometria planaGeometria no euclideana LC Class. No.: QA445 / R93 1986