TY  - JOUR
T1  - On Curvature and Orthogonal Surfaces. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 21
SP  - 166
EP  - 167
PY  - 1872/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1872.0036
M3  - doi:10.1098/rspl.1872.0036
AU  - Cayley, A.
ER  -