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Benzi, M., Simoncini, V.: On the eigenvalues of a class of saddle point matrices. Numer. Math. 103, 173–196 (2006)
Bergamaschi, L., Gondzio, J., Venturin, M., Zilli, G.: Inexact constraint preconditioners for linear system arising in interior point methods. Comput. Optim. Appl. 36, 137–147 (2007)
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The online version of the original article can be found under doi:http://dx.doi.org/10.1007/s10589-006-9001-0.
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Bergamaschi, L., Gondzio, J., Venturin, M. et al. Erratum to: Inexact constraint preconditioners for linear systems arising in interior point methods. Comput Optim Appl 49, 401–406 (2011). https://doi.org/10.1007/s10589-009-9298-6
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DOI: https://doi.org/10.1007/s10589-009-9298-6