https://www.juancmeza.com/research/publications/a-modification-to-the-gmres-method-for-ill-conditioned-linear-systems-pdf
A Modification to the GMRES Method for Ill-Conditioned Linear Systems (PDF) — Juan C. Meza
J.C. Meza , Technical Report SAND95-8220, Sandia National Laboratories (1995).
to thelinear systemsmodificationgmresmethod