Improved Error Bounds for Underdetermined System Solvers. Demmel, J. W. and Higham, N. J. SIAM J. Matrix Anal. Appl., 14(1):1-14, January, 1993.
doi  bibtex   
@article{dehi93,
  author =        {James W. Demmel and Nicholas J. Higham},
  journal =       {SIAM J. Matrix Anal. Appl.},
  month =         jan,
  number =        {1},
  pages =         {1-14},
  title =         {Improved Error Bounds for Underdetermined System
                   Solvers},
  volume =        {14},
  year =          {1993},
  doi =           {10.1137/0614001},
}
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