A new approach to the Darboux-Backlund transformation versus the   standard dressing method
  We present a new approach to the construction of the Darboux matrix. This is a generalization of the recently formulated method based on the assumption that the square of the Darboux matrix vanishes for some values of the spectral parameter. We consider the multisoliton case, the reduction problem and the discrete case. The relationship between our approach and the standard dressing method is discussed in detail. 
J.L.Cieslinski, W.Biernacki