TY  - JOUR
T1  - On Abstract Geometry. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 18
SP  - 122
EP  - 123
PY  - 1869/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1869.0032
M3  - doi:10.1098/rspl.1869.0032
AU  - Cayley, P.
ER  -