Classification of Bipartite and Tripartite Qutrit Entanglement under   SLOCC
  We classify biqutrit and triqutrit pure states under stochastic local operations and classical communication. By investigating the right singular vector spaces of the coefficient matrices of the states, we obtain explicitly two equivalent classes of biqutrit states and twelve equivalent classes of triqutrit states respectively. 
Xin-Gang Yang, Zhi-Xi Wang, Xiao-Hong Wang and Shao-Ming Fei