TY  - JOUR
T1  - On the Sextactic Points of a Plane Curve
JF  - Philosophical Transactions of the Royal Society of London (1776-1886)
VL  - 155
SP  - 653
EP  - 669
PY  - 1865/01/01/
UR  - http://dx.doi.org/10.1098/rstl.1865.0014
M3  - doi:10.1098/rstl.1865.0014
AU  - Spottiswoode, W.
ER  -