TY  - JOUR
T1  - On the Sextactic Points of a Plane Curve. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 14
SP  - 349
EP  - 351
PY  - 1865/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1865.0066
M3  - doi:10.1098/rspl.1865.0066
AU  - Spottiswoode, W.
ER  -