TY  - BOOK
AU  - Iversen,Birger
TI  - Hyperbolic geometry
SN  - 9780521435284
U1  - 516.9 IV3H 
PY  - 1992///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Geometry
KW  - Mathematics
KW  - Plane geometry
ER  -