A new linesearch algorithm for nonlinear least squares problems. - Per Lindström; Per-Åke Wedin (Math. Program., 1984)

Modifying the QR-Decomposition to Constrained and Weighted Linear Least Squares. - Mårten Gulliksson; Per-Åke Wedin (SIAM J. Matrix Anal. Appl., 1992)

Algorithms for Constrained and Weighted Nonlinear Least Squares. - Mårten Gulliksson; Inge Söderkvist; Per-Åke Wedin (SIAM J. Optim., 1997)

Perturbation theory for generalized and constrained linear least squares. - Mårten Gulliksson; Per-Åke Wedin (Numer. Linear Algebra Appl., 2000)

The Use and Properties of Tikhonov Filter Matrices. - Mårten Gulliksson; Per-Åke Wedin (SIAM J. Matrix Anal. Appl., 2000)

Truncated Gauss-Newton algorithms for Ill-conditioned nonlinear least squares problems. - Jerry Eriksson; Per-Åke Wedin (Optim. Methods Softw., 2004)