Analysis of preconditioners for conjugate gradients through distribution of eigenvalues. - F. F. Campos; John S. Rollett (Int. J. Comput. Math., 1995)

Using a hybrid preconditioner for solving large-scale linear systems arising from interior point methods. - Silvana Bocanegra; F. F. Campos; Aurelio R. L. Oliveira (Comput. Optim. Appl., 2007)

A note on hybrid preconditioners for large-scale normal equations arising from interior-point methods. - Marta I. Velazco Fontova; Aurelio R. L. Oliveira; F. F. Campos (Optim. Methods Softw., 2010)