Integrability of a t-J model with impurities
  A t-J model for correlated electrons with impurities is proposed. The impurities are introduced in such a way that integrability of the model in one dimension is not violated. The algebraic Bethe ansatz solution of the model is also given and it is shown that the Bethe states are highest weight states with respect to the supersymmetry algebra gl(2/1) 
Jon Links (University of Queensland, Australia), Angela Foerster   (Instituto de Fisica da UFRGS, Brazil)