TY  - JOUR
T1  - On the Contact of Conics with Surfaces. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 18
SP  - 264
EP  - 265
PY  - 1869/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1869.0061
M3  - doi:10.1098/rspl.1869.0061
AU  - Spottiswoode, W.
ER  -