TY  - GEN
AU  - Sommerville,D.M.Y.
TI  - The elements of non-euclidean geometry
U1  - 516 / S653e 
PY  - 1958///
CY  - New York
PB  - Dover
KW  - Geometria
N1  - Historical, cap.1  elementary hyperbolic geometry, cap.2  elliptic geometry, cap.3  analytical geometry, cap.4  representations of non-euclidean geometry in euclidean space, cap.5  space curvature and the philosophical bearing of non-euclidean geometry, cap.6  radical axes homothetic centres and systems of circles, cap.7  inversion and allied transformations, cap.8  the conic, cap.9
ER  -