TY  - BOOK
AU  - Gans,David
TI  - An introduction to non-Euclidean geometry
SN  - 0122748506
AV  - QA685 .G33
U1  - 516/.9 
PY  - 1973///]
CY  - New York
PB  - Academic Press
KW  - Geometry, Non-Euclidean
KW  - Local
N1  - Bibliography: p. 263
ER  -