Matrix iterative methods for elliptic differential equations. - Nancy K. Nichols (1966)

Smoothed histogram modification for image processing. - Jaroslav Kautsky; Nancy K. Nichols; David L. B. Jupp (Comput. Vis. Graph. Image Process., 1984)

Regularization of Descriptor Systems by Derivative and Proportional State Feedback. - Angelika Bunse-Gerstner; Volker Mehrmann; Nancy K. Nichols (SIAM J. Matrix Anal. Appl., 1992)

Regularization of descriptor systems by output feedback. - Angelika Bunse-Gerstner; Volker Mehrmann; Nancy K. Nichols (IEEE Trans. Autom. Control., 1994)

Robust Eigenstructure Assignment in Quadratic Matrix Polynomials: Nonsingular Case. - Nancy K. Nichols; Jaroslav Kautsky (SIAM J. Matrix Anal. Appl., 2001)

Robust Pole Assignment in Descriptor Linear Systems via State Feedback. - Guang-Ren Duan 001; Nancy K. Nichols; Guo-Ping Liu 003 (Eur. J. Control, 2002)

Approximate Gauss-Newton Methods for Nonlinear Least Squares Problems. - Serge Gratton; Amos S. Lawless; Nancy K. Nichols (SIAM J. Optim., 2007)

Diagnosing Horizontal and Inter-Channel Observation Error Correlations for SEVIRI Observations Using Observation-Minus-Background and Observation-Minus-Analysis Statistics. - Joanne A. Waller; Susan P. Ballard; Sarah L. Dance; Graeme Kelly; Nancy K. Nichols; David Simonin (Remote. Sens., 2016)

Observation impact, domain length and parameter estimation in data assimilation for flood forecasting. - Elizabeth S. Cooper; Sarah L. Dance; Javier García-Pintado; Nancy K. Nichols; Polly J. Smith (Environ. Model. Softw., 2018)

The conditioning of least-squares problems in variational data assimilation. - Jemima M. Tabeart; Sarah L. Dance; Stephen A. Haben; Amos S. Lawless; Nancy K. Nichols; Joanne A. Waller (Numer. Linear Algebra Appl., 2018)

The conditioning of least squares problems in preconditioned variational data assimilation. - Jemima M. Tabeart; Sarah L. Dance; Amos S. Lawless; Nancy K. Nichols; Joanne A. Waller (CoRR, 2020)

New bounds on the condition number of the Hessian of the preconditioned variational data assimilation problem. - Jemima M. Tabeart; Sarah L. Dance; Amos S. Lawless; Nancy K. Nichols; Joanne A. Waller (Numer. Linear Algebra Appl., 2022)

Conditioning of hybrid variational data assimilation. - Shaerdan Shataer; Amos S. Lawless; Nancy K. Nichols (Numer. Linear Algebra Appl., 2024)