Extreme rays in $3 \otimes 3$ entangled edge states with positive partial transposes
by Woo Chan Kim and Seung-Hyeok Kye
Phys. Lett. A, 369 (2007), 16-22.
In this paper, we show that the $3\otimes 3$ edge PPTES of the type $(5,5)$ found by Clarisse and Ha generate extreme rays in the cone of all positive semi-definite matrices with positive semi-definite partial transposes.