Preconditioning Indefinite Systems in Interior Point Methods for Optimization. Bergamaschi, L., Gondzio, J., & Zilli, G. Computational Optimization and Applications, 28:149–171, 2004.
bibtex   
@Article{Bergamaschi2004,
    author      = {Luca Bergamaschi and Jacek Gondzio and Giovanni Zilli},
    title       = {Preconditioning Indefinite Systems in Interior Point Methods for Optimization},
    journal     = {Computational Optimization and Applications},
    pages       = {149--171},
    volume      = {28},
    year        = {2004}
}

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