@article{etna_vol18_pp101-136,
  author  = {M. Isabel Bueno and Froil\'an M. Dopico},
  title   = {Stability and sensivity of Darboux tranformation without parameter},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {18},
  year    = {2004},
  pages   = {101--136},
}