Generalized coordinate Bethe ansatz for non diagonal boundaries
  We compute the spectrum and the eigenstates of the open XXX model with non-diagonal (triangular) boundary matrices. Since the boundary matrices are not diagonal, the usual coordinate Bethe ansatz does not work anymore, and we use a generalization of it to solve the problem. 
N. Crampe and E. Ragoucy
hep-th cond-mat.str-el