Classification and Quantification of Entangled Bipartite Qutrit Pure   States
  A complete analysis of entangled bipartite qutrit pure states is carried out based on a simple entanglement measure. An analysis of all possible extremally entangled pure bipartite qutrit states is shown to reduce, with the help of SLOCC transformations, to three distinct types. The analysis and the results should be helpful for finding different entanglement types in multipartite pure state systems. 
Feng Pan, Guoying Lu, and J. P. Draayer