Construction of $3\otimes 3$ entangled edge states with positive partial   transposes
  We construct a class of $3\otimes 3$ entangled edge states with positive partial transposes using indecomposable positive linear maps. This class contains several new types of entangled edge states with respect to the range dimensions of themselves and their partial transposes. 
Kil-Chan Ha and Seung-Hyeok Kye