TY  - BOOK
AU  - Foote, Robert L.
AU  - Sun, Xidian 
TI  - An intrinsic formula for the cross ratio in spherical and hyperbolic geometries
SN  - 0746-8342
U1  - DPer 510.5 C697 Jan 2012-Sept 2015 v. 43 & 46, n. 1-4 
PY  - 2012///-Sept 2015
CY  - Washington D. C.
PB  - Mathematical Association of America
KW  - Geometry
ER  -