TY  - BOOK
AU  - Gans,David
TI  - An introduction to non-Euclidean geometry
SN  - 0122748506
U1  - 513.8 
PY  - 1973///
CY  - New York
PB  - Academic Press
KW  - Geometry, Non-Euclidean
KW  - Mathematics
N1  - Includes index; Bibliography: p. 263
ER  -