Accuracy and Stability of the Null Space Method for Solving the Equality Constrained Least Squares Problem. Cox, A. J. & Higham, N. J. BIT, 39(1):34-50, 1999.
doi  bibtex   
@article{cohi99,
  author =        {Anthony J. Cox and Nicholas J. Higham},
  journal =       {BIT},
  number =        {1},
  pages =         {34-50},
  title =         {Accuracy and Stability of the Null Space Method for
                   Solving the Equality Constrained Least Squares
                   Problem},
  volume =        {39},
  year =          {1999},
  doi =           {10.1023/A:1022365107361},
}

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