Least squares problems
 The Equality
Constrained Indefinite Least Squares Problem: Theory and Algorithms (with Adam
Bojanczyk and Harikrishna Patel), BIT 41(3): 505517, 2003.
 Solving
the Indefinite Least Squares Problem by Hyperbolic QR Factorization (with Adam
Bojanczyk and Harikrishna Patel), SIAM J. Matrix Anal. Appl., 24(4),
914931, 2003.
 Backward
Error Bounds for Constrained Least Squares Problems (with Anthony
J. Cox), BIT, 39(2), 210227, 1999.
 Accuracy
and Stability of the Null Space Method for Solving the Equality Constrained
Least Squares Problem (with Anthony J. Cox), BIT, 39(1), 3450, 1999.
 RowWise
Backward Stable Elimination Methods for the Equality Constrained Least
Squares Problem , (with Anthony J. Cox), SIAM J. Matrix Anal. Appl.,
21(1), 313326, 1999.
 Stability
of Householder QR Factorization for Weighted Least Squares Problems (with
Anthony J. Cox), in Numerical Analysis 1997, Proceedings of the 17th Dundee
Biennial Conference, D. F. Griffiths and D. J. Higham and G. A. Watson
eds., Pitman Research Notes in Mathematics 380, 1998, pages 5783.
 The Symmetric
Procrustes Problem , BIT, 28, 133143, 1988.

Computing Error Bounds for Regression Problems.
In P. J. Brown and W. A. Fuller, editors, Statistical Analysis
of Measurement Error Models and Applications, Contemporary Mathematics 112,
pages 195208. American Mathematical Society, Providence, Rhode Island,
1990.
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