Least squares problems

• The Equality Constrained Indefinite Least Squares Problem: Theory and Algorithms (with Adam Bojanczyk and Harikrishna Patel), BIT 41(3): 505-517, 2003.
• Solving the Indefinite Least Squares Problem by Hyperbolic QR Factorization (with Adam Bojanczyk and Harikrishna Patel), SIAM J. Matrix Anal. Appl., 24(4), 914-931, 2003.
• Backward Error Bounds for Constrained Least Squares Problems (with Anthony J. Cox), BIT, 39(2), 210-227, 1999.
• Accuracy and Stability of the Null Space Method for Solving the Equality Constrained Least Squares Problem (with Anthony J. Cox), BIT, 39(1), 34-50, 1999.
• Row-Wise Backward Stable Elimination Methods for the Equality Constrained Least Squares Problem , (with Anthony J. Cox), SIAM J. Matrix Anal. Appl., 21(1), 313-326, 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 57-83.
• The Symmetric Procrustes Problem , BIT, 28, 133-143, 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 195-208. American Mathematical Society, Providence, Rhode Island, 1990.